pars0pars.c 44.3 KB
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/******************************************************
SQL parser

(c) 1996 Innobase Oy

Created 11/19/1996 Heikki Tuuri
*******************************************************/

/* Historical note: Innobase executed its first SQL string (CREATE TABLE)
on 1/27/1998 */

#include "pars0pars.h"

#ifdef UNIV_NONINL
#include "pars0pars.ic"
#endif

#include "row0sel.h"
#include "row0ins.h"
#include "row0upd.h"
#include "dict0dict.h"
#include "dict0mem.h"
#include "dict0crea.h"
#include "que0que.h"
#include "pars0grm.h"
#include "pars0opt.h"
#include "data0data.h"
#include "data0type.h"
#include "trx0trx.h"
#include "trx0roll.h"
#include "lock0lock.h"
#include "eval0eval.h"

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#ifdef UNIV_SQL_DEBUG
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/* If the following is set TRUE, the lexer will print the SQL string
as it tokenizes it */

ibool	pars_print_lexed	= FALSE;
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#endif /* UNIV_SQL_DEBUG */
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/* Global variable used while parsing a single procedure or query : the code is
NOT re-entrant */
sym_tab_t*	pars_sym_tab_global;

/* Global variables used to denote certain reserved words, used in
constructing the parsing tree */

pars_res_word_t	pars_to_char_token = {PARS_TO_CHAR_TOKEN};
pars_res_word_t	pars_to_number_token = {PARS_TO_NUMBER_TOKEN};
pars_res_word_t	pars_to_binary_token = {PARS_TO_BINARY_TOKEN};
pars_res_word_t	pars_binary_to_number_token = {PARS_BINARY_TO_NUMBER_TOKEN};
pars_res_word_t	pars_substr_token = {PARS_SUBSTR_TOKEN};
pars_res_word_t	pars_replstr_token = {PARS_REPLSTR_TOKEN};
pars_res_word_t	pars_concat_token = {PARS_CONCAT_TOKEN};
pars_res_word_t	pars_instr_token = {PARS_INSTR_TOKEN};
pars_res_word_t	pars_length_token = {PARS_LENGTH_TOKEN};
pars_res_word_t	pars_sysdate_token = {PARS_SYSDATE_TOKEN};
pars_res_word_t	pars_printf_token = {PARS_PRINTF_TOKEN};
pars_res_word_t	pars_assert_token = {PARS_ASSERT_TOKEN};
pars_res_word_t	pars_rnd_token = {PARS_RND_TOKEN};
pars_res_word_t	pars_rnd_str_token = {PARS_RND_STR_TOKEN};
pars_res_word_t	pars_count_token = {PARS_COUNT_TOKEN};
pars_res_word_t	pars_sum_token = {PARS_SUM_TOKEN};
pars_res_word_t	pars_distinct_token = {PARS_DISTINCT_TOKEN};
pars_res_word_t	pars_int_token = {PARS_INT_TOKEN};
pars_res_word_t	pars_char_token = {PARS_CHAR_TOKEN};
pars_res_word_t	pars_float_token = {PARS_FLOAT_TOKEN};
pars_res_word_t	pars_update_token = {PARS_UPDATE_TOKEN};
pars_res_word_t	pars_asc_token = {PARS_ASC_TOKEN};
pars_res_word_t	pars_desc_token = {PARS_DESC_TOKEN};
pars_res_word_t	pars_open_token = {PARS_OPEN_TOKEN};
pars_res_word_t	pars_close_token = {PARS_CLOSE_TOKEN};
pars_res_word_t	pars_consistent_token = {PARS_CONSISTENT_TOKEN};
pars_res_word_t	pars_unique_token = {PARS_UNIQUE_TOKEN};
pars_res_word_t	pars_clustered_token = {PARS_CLUSTERED_TOKEN};

/* Global variable used to denote the '*' in SELECT * FROM.. */
#define PARS_STAR_DENOTER	12345678
ulint	pars_star_denoter	= PARS_STAR_DENOTER;


/*************************************************************************
Determines the class of a function code. */
static
ulint
pars_func_get_class(
/*================*/
			/* out: function class: PARS_FUNC_ARITH, ... */
	int	func)	/* in: function code: '=', PARS_GE_TOKEN, ... */
{
	if ((func == '+') || (func == '-') || (func == '*') || (func == '/')) {

		return(PARS_FUNC_ARITH);

	} else if ((func == '=') || (func == '<') || (func == '>')
		   || (func == PARS_GE_TOKEN) || (func == PARS_LE_TOKEN)
		   || (func == PARS_NE_TOKEN)) {

		return(PARS_FUNC_CMP);

	} else if ((func == PARS_AND_TOKEN) || (func == PARS_OR_TOKEN)
		   || (func == PARS_NOT_TOKEN)) {

		return(PARS_FUNC_LOGICAL);

	} else if ((func == PARS_COUNT_TOKEN) || (func == PARS_SUM_TOKEN)) {

		return(PARS_FUNC_AGGREGATE);

	} else if ((func == PARS_TO_CHAR_TOKEN)
		   || (func == PARS_TO_NUMBER_TOKEN)
		   || (func == PARS_TO_BINARY_TOKEN)
		   || (func == PARS_BINARY_TO_NUMBER_TOKEN)
		   || (func == PARS_SUBSTR_TOKEN)
		   || (func == PARS_CONCAT_TOKEN)
		   || (func == PARS_LENGTH_TOKEN)
		   || (func == PARS_INSTR_TOKEN)
		   || (func == PARS_SYSDATE_TOKEN)
		   || (func == PARS_NOTFOUND_TOKEN)
		   || (func == PARS_PRINTF_TOKEN)
		   || (func == PARS_ASSERT_TOKEN)
		   || (func == PARS_RND_TOKEN)
		   || (func == PARS_RND_STR_TOKEN)
		   || (func == PARS_REPLSTR_TOKEN)) {

		return(PARS_FUNC_PREDEFINED);
	} else {
		return(PARS_FUNC_OTHER);
	}
}
	
/*************************************************************************
Parses an operator or predefined function expression. */
static
func_node_t*
pars_func_low(
/*==========*/
				/* out, own: function node in a query tree */
	int		func,	/* in: function token code */
	que_node_t*	arg)	/* in: first argument in the argument list */
{
	func_node_t*	node;

	node = mem_heap_alloc(pars_sym_tab_global->heap, sizeof(func_node_t));

	node->common.type = QUE_NODE_FUNC;
	dfield_set_data(&(node->common.val), NULL, 0);
	node->common.val_buf_size = 0;
	
	node->func = func;

	node->class = pars_func_get_class(func);

	node->args = arg;

	UT_LIST_ADD_LAST(func_node_list, pars_sym_tab_global->func_node_list,
								node);
	return(node);
}

/*************************************************************************
Parses a function expression. */

func_node_t*
pars_func(
/*======*/
				/* out, own: function node in a query tree */
	que_node_t* 	res_word,/* in: function name reserved word */
	que_node_t*	arg)	/* in: first argument in the argument list */
{
	return(pars_func_low(((pars_res_word_t*)res_word)->code, arg));
}

/*************************************************************************
Parses an operator expression. */

func_node_t*
pars_op(
/*====*/
				/* out, own: function node in a query tree */
	int		func,	/* in: operator token code */
	que_node_t*	arg1,	/* in: first argument */
	que_node_t*	arg2)	/* in: second argument or NULL for an unary
				operator */
{
	que_node_list_add_last(NULL, arg1);

	if (arg2) {
		que_node_list_add_last(arg1, arg2);
	}

	return(pars_func_low(func, arg1));
}

/*************************************************************************
Parses an ORDER BY clause. Order by a single column only is supported. */

order_node_t*
pars_order_by(
/*==========*/
				/* out, own: order-by node in a query tree */
	sym_node_t*	column,	/* in: column name */
	pars_res_word_t* asc)	/* in: &pars_asc_token or pars_desc_token */
{
	order_node_t*	node;

	node = mem_heap_alloc(pars_sym_tab_global->heap, sizeof(order_node_t));

	node->common.type = QUE_NODE_ORDER;
	
	node->column = column;

	if (asc == &pars_asc_token) {
		node->asc = TRUE;
	} else {
		ut_a(asc == &pars_desc_token);
		node->asc = FALSE;
	}

	return(node);
}

/*************************************************************************
Resolves the data type of a function in an expression. The argument data
types must already be resolved. */
static
void
pars_resolve_func_data_type(
/*========================*/
	func_node_t*	node)	/* in: function node */
{
	que_node_t*	arg;
	ulint		func;

	ut_a(que_node_get_type(node) == QUE_NODE_FUNC);
	
	arg = node->args;

	func = node->func;

	if ((func == PARS_SUM_TOKEN)
	    		|| (func == '+') || (func == '-') || (func == '*')
			|| (func == '/') || (func == '+')) {
	
		/* Inherit the data type from the first argument (which must
		not be the SQL null literal whose type is DATA_ERROR) */

		dtype_copy(que_node_get_data_type(node),
					que_node_get_data_type(arg));

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		ut_a(dtype_get_mtype(que_node_get_data_type(node))
								== DATA_INT);
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	} else if (func == PARS_COUNT_TOKEN) {
		ut_a(arg);
		dtype_set(que_node_get_data_type(node), DATA_INT, 0, 4, 0);
		
	} else if (func == PARS_TO_CHAR_TOKEN) {
		ut_a(dtype_get_mtype(que_node_get_data_type(arg)) == DATA_INT);
		dtype_set(que_node_get_data_type(node), DATA_VARCHAR,
							DATA_ENGLISH, 0, 0);
	} else if (func == PARS_TO_BINARY_TOKEN) {
		ut_a(dtype_get_mtype(que_node_get_data_type(arg)) == DATA_INT);
		dtype_set(que_node_get_data_type(node), DATA_VARCHAR,
							DATA_ENGLISH, 0, 0);
	} else if (func == PARS_TO_NUMBER_TOKEN) {
		ut_a(dtype_get_mtype(que_node_get_data_type(arg))
							== DATA_VARCHAR);
		dtype_set(que_node_get_data_type(node), DATA_INT, 0, 4, 0);

	} else if (func == PARS_BINARY_TO_NUMBER_TOKEN) {
		ut_a(dtype_get_mtype(que_node_get_data_type(arg))
							== DATA_VARCHAR);
		dtype_set(que_node_get_data_type(node), DATA_INT, 0, 4, 0);

	} else if (func == PARS_LENGTH_TOKEN) {
		ut_a(dtype_get_mtype(que_node_get_data_type(arg))
							== DATA_VARCHAR);
		dtype_set(que_node_get_data_type(node), DATA_INT, 0, 4, 0);

	} else if (func == PARS_INSTR_TOKEN) {
		ut_a(dtype_get_mtype(que_node_get_data_type(arg))
							== DATA_VARCHAR);
		dtype_set(que_node_get_data_type(node), DATA_INT, 0, 4, 0);

	} else if (func == PARS_SYSDATE_TOKEN) {
		ut_a(arg == NULL);
		dtype_set(que_node_get_data_type(node), DATA_INT, 0, 4, 0);

	} else if ((func == PARS_SUBSTR_TOKEN)
			|| (func == PARS_CONCAT_TOKEN)) {

		ut_a(dtype_get_mtype(que_node_get_data_type(arg))
							== DATA_VARCHAR);
		dtype_set(que_node_get_data_type(node), DATA_VARCHAR,
							DATA_ENGLISH, 0, 0);

	} else if ((func == '>') || (func == '<') || (func == '=')
		   || (func == PARS_GE_TOKEN)
		   || (func == PARS_LE_TOKEN)
		   || (func == PARS_NE_TOKEN)
		   || (func == PARS_AND_TOKEN)
		   || (func == PARS_OR_TOKEN)
		   || (func == PARS_NOT_TOKEN)
		   || (func == PARS_NOTFOUND_TOKEN)) {

		/* We currently have no iboolean type: use integer type */
		dtype_set(que_node_get_data_type(node), DATA_INT, 0, 4, 0);

	} else if (func == PARS_RND_TOKEN) {
		ut_a(dtype_get_mtype(que_node_get_data_type(arg)) == DATA_INT);

		dtype_set(que_node_get_data_type(node), DATA_INT, 0, 4, 0);

	} else if (func == PARS_RND_STR_TOKEN) {
		ut_a(dtype_get_mtype(que_node_get_data_type(arg)) == DATA_INT);

		dtype_set(que_node_get_data_type(node), DATA_VARCHAR,
							DATA_ENGLISH, 0, 0);
	} else {
		ut_error;
	}
}

/*************************************************************************
Resolves the meaning of variables in an expression and the data types of
functions. It is an error if some identifier cannot be resolved here. */
static
void
pars_resolve_exp_variables_and_types(
/*=================================*/
	sel_node_t*	select_node,	/* in: select node or NULL; if
					this is not NULL then the variable
					sym nodes are added to the
					copy_variables list of select_node */
	que_node_t*	exp_node)	/* in: expression */
{
	func_node_t*	func_node;
	que_node_t*	arg;
	sym_node_t*	sym_node;
	sym_node_t*	node;

	ut_a(exp_node);

	if (que_node_get_type(exp_node) == QUE_NODE_FUNC) {
		func_node = exp_node;

		arg = func_node->args;

		while (arg) {
			pars_resolve_exp_variables_and_types(select_node, arg);

			arg = que_node_get_next(arg);
		}

		pars_resolve_func_data_type(func_node);

		return;
	}
		
	ut_a(que_node_get_type(exp_node) == QUE_NODE_SYMBOL);

	sym_node = exp_node;

	if (sym_node->resolved) {

		return;
	}
		
	/* Not resolved yet: look in the symbol table for a variable
	or a cursor with the same name */

	node = UT_LIST_GET_FIRST(pars_sym_tab_global->sym_list);

	while (node) {
		if (node->resolved
			&& ((node->token_type == SYM_VAR)
					|| (node->token_type == SYM_CURSOR))
			&& node->name
			&& (sym_node->name_len == node->name_len)
			&& (ut_memcmp(sym_node->name, node->name,
						node->name_len) == 0)) {

				/* Found a variable or a cursor declared with
				the same name */
				
				break;
		}

		node = UT_LIST_GET_NEXT(sym_list, node);
	}

	if (!node) {
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		fprintf(stderr, "PARSER ERROR: Unresolved identifier %s\n",
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							sym_node->name);
	}
	
	ut_a(node);

	sym_node->resolved = TRUE;
	sym_node->token_type = SYM_IMPLICIT_VAR;
	sym_node->alias = node;		
	sym_node->indirection = node;

	if (select_node) {
		UT_LIST_ADD_LAST(col_var_list, select_node->copy_variables,
								sym_node);
	}

	dfield_set_type(que_node_get_val(sym_node),
					que_node_get_data_type(node));
}

/*************************************************************************
Resolves the meaning of variables in an expression list. It is an error if
some identifier cannot be resolved here. Resolves also the data types of
functions. */
static
void
pars_resolve_exp_list_variables_and_types(
/*======================================*/
	sel_node_t*	select_node,	/* in: select node or NULL */
	que_node_t*	exp_node)	/* in: expression list first node, or
					NULL */
{
	while (exp_node) {
		pars_resolve_exp_variables_and_types(select_node, exp_node);

		exp_node = que_node_get_next(exp_node);
	}
}

/*************************************************************************
Resolves the columns in an expression. */
static
void
pars_resolve_exp_columns(
/*=====================*/
	sym_node_t*	table_node,	/* in: first node in a table list */
	que_node_t*	exp_node)	/* in: expression */
{
	func_node_t*	func_node;
	que_node_t*	arg;
	sym_node_t*	sym_node;
	dict_table_t*	table;
	sym_node_t*	t_node;
	dict_col_t*	col;
	ulint		n_cols;
	ulint		i;

	ut_a(exp_node);

	if (que_node_get_type(exp_node) == QUE_NODE_FUNC) {
		func_node = exp_node;

		arg = func_node->args;

		while (arg) {
			pars_resolve_exp_columns(table_node, arg);

			arg = que_node_get_next(arg);
		}

		return;
	}
		
	ut_a(que_node_get_type(exp_node) == QUE_NODE_SYMBOL);

	sym_node = exp_node;

	if (sym_node->resolved) {

		return;
	}
		
	/* Not resolved yet: look in the table list for a column with the
	same name */

	t_node = table_node;

	while (t_node) {
		table = t_node->table;

		n_cols = dict_table_get_n_user_cols(table);

		for (i = 0; i < n_cols; i++) {
			col = dict_table_get_nth_col(table, i);

			if ((sym_node->name_len == ut_strlen(col->name))
			    && (0 == ut_memcmp(sym_node->name, col->name,
			    			sym_node->name_len))) {
			    	/* Found */
				sym_node->resolved = TRUE;
				sym_node->token_type = SYM_COLUMN;
				sym_node->table = table;
				sym_node->col_no = i;
				sym_node->prefetch_buf = NULL;
				
				dfield_set_type(&(sym_node->common.val),
						dict_col_get_type(col));
				return;
			}
		}

		t_node = que_node_get_next(t_node);
	}
}

/*************************************************************************
Resolves the meaning of columns in an expression list. */
static
void
pars_resolve_exp_list_columns(
/*==========================*/
	sym_node_t*	table_node,	/* in: first node in a table list */
	que_node_t*	exp_node)	/* in: expression list first node, or
					NULL */
{
	while (exp_node) {
		pars_resolve_exp_columns(table_node, exp_node);

		exp_node = que_node_get_next(exp_node);
	}
}

/*************************************************************************
Retrieves the table definition for a table name id. */
static
void
pars_retrieve_table_def(
/*====================*/
	sym_node_t*	sym_node)	/* in: table node */
{
	char*	table_name;

	ut_a(sym_node);
	ut_a(que_node_get_type(sym_node) == QUE_NODE_SYMBOL);

	sym_node->resolved = TRUE;
	sym_node->token_type = SYM_TABLE;

	table_name = (char*) sym_node->name;
	
	sym_node->table = dict_table_get_low(table_name);

	ut_a(sym_node->table);
}

/*************************************************************************
Retrieves the table definitions for a list of table name ids. */
static
ulint
pars_retrieve_table_list_defs(
/*==========================*/
					/* out: number of tables */
	sym_node_t*	sym_node)	/* in: first table node in list */
{
	ulint		count		= 0;
	
	if (sym_node == NULL) {

		return(count);
	}

	while (sym_node) {
		pars_retrieve_table_def(sym_node);

		count++;

		sym_node = que_node_get_next(sym_node);
	}

	return(count);
}

/*************************************************************************
Adds all columns to the select list if the query is SELECT * FROM ... */
static
void
pars_select_all_columns(
/*====================*/
	sel_node_t*	select_node)	/* in: select node already containing
					the table list */
{
	sym_node_t*	col_node;
	sym_node_t*	table_node;
	dict_table_t*	table;
	dict_col_t*	col;
	ulint		i;

	select_node->select_list = NULL;
	
	table_node = select_node->table_list;

	while (table_node) {
		table = table_node->table;

		for (i = 0; i < dict_table_get_n_user_cols(table); i++) {

			col = dict_table_get_nth_col(table, i);

			col_node = sym_tab_add_id(pars_sym_tab_global,
						(byte*)col->name,
						ut_strlen(col->name));
			select_node->select_list
					= que_node_list_add_last(
						select_node->select_list,
								col_node);
		}

		table_node = que_node_get_next(table_node);
	}
}

/*************************************************************************
Parses a select list; creates a query graph node for the whole SELECT
statement. */

sel_node_t*
pars_select_list(
/*=============*/
					/* out, own: select node in a query
					tree */
	que_node_t*	select_list,	/* in: select list */
	sym_node_t*	into_list)	/* in: variables list or NULL */
{
	sel_node_t*	node;

	node = sel_node_create(pars_sym_tab_global->heap);
	
	node->select_list = select_list;
	node->into_list = into_list;

	pars_resolve_exp_list_variables_and_types(NULL, into_list);

	return(node);
}

/*************************************************************************
Checks if the query is an aggregate query, in which case the selct list must
contain only aggregate function items. */
static
void
pars_check_aggregate(
/*=================*/
	sel_node_t*	select_node)	/* in: select node already containing
					the select list */
{
	que_node_t*	exp_node;
	func_node_t*	func_node;
	ulint		n_nodes			= 0;
	ulint		n_aggregate_nodes	= 0;

	exp_node = select_node->select_list;

	while (exp_node) {

		n_nodes++;
	
		if (que_node_get_type(exp_node) == QUE_NODE_FUNC) {

			func_node = exp_node;

			if (func_node->class == PARS_FUNC_AGGREGATE) {

				n_aggregate_nodes++;
			}
		}

		exp_node = que_node_get_next(exp_node);
	}

	if (n_aggregate_nodes > 0) {
		ut_a(n_nodes == n_aggregate_nodes);

		select_node->is_aggregate = TRUE;
	} else {
		select_node->is_aggregate = FALSE;
	}
}

/*************************************************************************
Parses a select statement. */

sel_node_t*
pars_select_statement(
/*==================*/
					/* out, own: select node in a query
					tree */
	sel_node_t*	select_node,	/* in: select node already containing
					the select list */
	sym_node_t*	table_list,	/* in: table list */
	que_node_t*	search_cond,	/* in: search condition or NULL */
	pars_res_word_t* for_update,	/* in: NULL or &pars_update_token */
	pars_res_word_t* consistent_read,/* in: NULL or
						&pars_consistent_token */
	order_node_t*	order_by)	/* in: NULL or an order-by node */
{
	select_node->state = SEL_NODE_OPEN;

	select_node->table_list = table_list;
	select_node->n_tables = pars_retrieve_table_list_defs(table_list);

	if (select_node->select_list == &pars_star_denoter) {

		/* SELECT * FROM ... */
		pars_select_all_columns(select_node);
	}
	
	if (select_node->into_list) {
		ut_a(que_node_list_get_len(select_node->into_list)
			== que_node_list_get_len(select_node->select_list));
	}

	UT_LIST_INIT(select_node->copy_variables);

	pars_resolve_exp_list_columns(table_list, select_node->select_list);
	pars_resolve_exp_list_variables_and_types(select_node,
						select_node->select_list);
	pars_check_aggregate(select_node);

	select_node->search_cond = search_cond;

	if (search_cond) {
		pars_resolve_exp_columns(table_list, search_cond);
		pars_resolve_exp_variables_and_types(select_node, search_cond);
	}

	if (for_update) {
		ut_a(!consistent_read);
		select_node->set_x_locks = TRUE;
		select_node->row_lock_mode = LOCK_X;
	} else {
		select_node->set_x_locks = FALSE;
		select_node->row_lock_mode = LOCK_S;
	}

	if (consistent_read) {
		select_node->consistent_read = TRUE;
	} else {
		select_node->consistent_read = FALSE;
		select_node->read_view = NULL;
	}

	select_node->order_by = order_by;

	if (order_by) {
		pars_resolve_exp_columns(table_list, order_by->column);
	}
	
	/* The final value of the following fields depend on the environment
	where the select statement appears: */

	select_node->can_get_updated = FALSE;
	select_node->explicit_cursor = NULL;

	opt_search_plan(select_node);

	return(select_node);
}

/*************************************************************************
Parses a cursor declaration. */

que_node_t*
pars_cursor_declaration(
/*====================*/
					/* out: sym_node */
	sym_node_t*	sym_node,	/* in: cursor id node in the symbol
					table */
	sel_node_t*	select_node)	/* in: select node */
{
	sym_node->resolved = TRUE;
	sym_node->token_type = SYM_CURSOR;
	sym_node->cursor_def = select_node;

	select_node->state = SEL_NODE_CLOSED;
	select_node->explicit_cursor = sym_node;

	return(sym_node);	
}

/*************************************************************************
Parses a delete or update statement start. */

upd_node_t*
pars_update_statement_start(
/*========================*/
					/* out, own: update node in a query
					tree */
	ibool		is_delete,	/* in: TRUE if delete */
	sym_node_t*	table_sym,	/* in: table name node */
	col_assign_node_t* col_assign_list)/* in: column assignment list, NULL
					if delete */	
{
	upd_node_t*	node;
	
	node = upd_node_create(pars_sym_tab_global->heap);

	node->is_delete = is_delete;

	node->table_sym = table_sym;
	node->col_assign_list = col_assign_list;

	return(node);
}
	
/*************************************************************************
Parses a column assignment in an update. */

col_assign_node_t*
pars_column_assignment(
/*===================*/
				/* out: column assignment node */
	sym_node_t*	column,	/* in: column to assign */
	que_node_t*	exp)	/* in: value to assign */
{
	col_assign_node_t*	node;

	node = mem_heap_alloc(pars_sym_tab_global->heap,
						sizeof(col_assign_node_t));
	node->common.type = QUE_NODE_COL_ASSIGNMENT;

	node->col = column;
	node->val = exp;

	return(node);
}

/*************************************************************************
Processes an update node assignment list. */
static
void
pars_process_assign_list(
/*=====================*/
	upd_node_t*	node)	/* in: update node */
{
	col_assign_node_t*	col_assign_list;
	sym_node_t*		table_sym;
	col_assign_node_t*	assign_node;
	upd_field_t*		upd_field;
	dict_index_t*		clust_index;
	sym_node_t*		col_sym;
	ulint			changes_ord_field;
	ulint			changes_field_size;
	ulint			n_assigns;
	ulint			i;

	table_sym = node->table_sym;
	col_assign_list = node->col_assign_list;
	clust_index = dict_table_get_first_index(node->table);
	
	assign_node = col_assign_list;
	n_assigns = 0;

	while (assign_node) {
		pars_resolve_exp_columns(table_sym, assign_node->col);
		pars_resolve_exp_columns(table_sym, assign_node->val);
		pars_resolve_exp_variables_and_types(NULL, assign_node->val);

		/* ut_a(dtype_get_mtype(dfield_get_type(
				que_node_get_val(assign_node->col)))
		     == dtype_get_mtype(dfield_get_type(
				que_node_get_val(assign_node->val)))); */

		/* Add to the update node all the columns found in assignment
		values as columns to copy: therefore, TRUE */

		opt_find_all_cols(TRUE, clust_index, &(node->columns), NULL,
							assign_node->val);
		n_assigns++;

		assign_node = que_node_get_next(assign_node);
	}

	node->update = upd_create(n_assigns, pars_sym_tab_global->heap);

	assign_node = col_assign_list;

	changes_field_size = UPD_NODE_NO_SIZE_CHANGE;

	for (i = 0; i < n_assigns; i++) {
		upd_field = upd_get_nth_field(node->update, i);

		col_sym = assign_node->col;

		upd_field_set_field_no(upd_field,
				dict_index_get_nth_col_pos(clust_index,
							col_sym->col_no),
								clust_index);
		upd_field->exp = assign_node->val;

		if (!dtype_is_fixed_size(
			dict_index_get_nth_type(clust_index,
						upd_field->field_no))) {
			changes_field_size = 0;
		}					
		
		assign_node = que_node_get_next(assign_node);
	}

	/* Find out if the update can modify an ordering field in any index */

	changes_ord_field = UPD_NODE_NO_ORD_CHANGE;

905 906
	if (row_upd_changes_some_index_ord_field_binary(node->table,
							node->update)) {
907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578
		changes_ord_field = 0;
	}
	
	node->cmpl_info = changes_ord_field | changes_field_size;
}
	
/*************************************************************************
Parses an update or delete statement. */

upd_node_t*
pars_update_statement(
/*==================*/
					/* out, own: update node in a query
					tree */
	upd_node_t*	node,		/* in: update node */
	sym_node_t*	cursor_sym,	/* in: pointer to a cursor entry in
					the symbol table or NULL */
	que_node_t*	search_cond)	/* in: search condition or NULL */
{
	sym_node_t*	table_sym;
	sel_node_t*	sel_node;
	plan_t*		plan;

	table_sym = node->table_sym;
	
	pars_retrieve_table_def(table_sym);
	node->table = table_sym->table;

	UT_LIST_INIT(node->columns);
	
	/* Make the single table node into a list of table nodes of length 1 */
	
	que_node_list_add_last(NULL, table_sym);

	if (cursor_sym) {
		pars_resolve_exp_variables_and_types(NULL, cursor_sym);

		sel_node = cursor_sym->alias->cursor_def;

		node->searched_update = FALSE;
	} else {
		sel_node = pars_select_list(NULL, NULL);

		pars_select_statement(sel_node, table_sym, search_cond, NULL,
								NULL, NULL);
		node->searched_update = TRUE;
		sel_node->common.parent = node;
	}
	
	node->select = sel_node;

	ut_a(!node->is_delete || (node->col_assign_list == NULL));
	ut_a(node->is_delete || (node->col_assign_list != NULL));

	if (node->is_delete) {
		node->cmpl_info = 0;
	} else {
		pars_process_assign_list(node);
	}

	if (node->searched_update) {
		node->has_clust_rec_x_lock = TRUE;
		sel_node->set_x_locks = TRUE;
		sel_node->row_lock_mode = LOCK_X;
	} else {
		node->has_clust_rec_x_lock = sel_node->set_x_locks;
	}

	ut_a(sel_node->n_tables == 1);
	ut_a(sel_node->consistent_read == FALSE);
	ut_a(sel_node->order_by == NULL);
	ut_a(sel_node->is_aggregate == FALSE);

	sel_node->can_get_updated = TRUE;
	
	node->state = UPD_NODE_UPDATE_CLUSTERED;
	
	plan = sel_node_get_nth_plan(sel_node, 0);

	plan->no_prefetch = TRUE;

	if (!((plan->index)->type & DICT_CLUSTERED)) {

		plan->must_get_clust = TRUE;

		node->pcur = &(plan->clust_pcur);
	} else {
		node->pcur = &(plan->pcur);
	}

	if (!node->is_delete && node->searched_update
			&& (node->cmpl_info & UPD_NODE_NO_SIZE_CHANGE)
			&& (node->cmpl_info & UPD_NODE_NO_ORD_CHANGE)) {

		/* The select node can perform the update in-place */

		ut_a(plan->asc);

		node->select_will_do_update = TRUE;
		sel_node->select_will_do_update = TRUE;
		sel_node->latch_mode = BTR_MODIFY_LEAF;
	}

	return(node);
}

/*************************************************************************
Parses an insert statement. */

ins_node_t*
pars_insert_statement(
/*==================*/
					/* out, own: update node in a query
					tree */
	sym_node_t*	table_sym,	/* in: table name node */
	que_node_t* 	values_list,	/* in: value expression list or NULL */
	sel_node_t*	select)		/* in: select condition or NULL */
{
	ins_node_t*	node;
	dtuple_t*	row;
	ulint		ins_type;

	ut_a(values_list || select);
	ut_a(!values_list || !select);

	if (values_list) {
		ins_type = INS_VALUES;
	} else {
		ins_type = INS_SEARCHED;
	}

	pars_retrieve_table_def(table_sym);

	node = ins_node_create(ins_type, table_sym->table,
						pars_sym_tab_global->heap);

	row = dtuple_create(pars_sym_tab_global->heap,
					dict_table_get_n_cols(node->table));

	dict_table_copy_types(row, table_sym->table);

	ins_node_set_new_row(node, row);

	node->select = select;

	if (select) {
		select->common.parent = node;

		ut_a(que_node_list_get_len(select->select_list)
			== dict_table_get_n_user_cols(table_sym->table));
	}
	
	node->values_list = values_list;

	if (node->values_list) {
		pars_resolve_exp_list_variables_and_types(NULL, values_list);

		ut_a(que_node_list_get_len(values_list)
			== dict_table_get_n_user_cols(table_sym->table));
	}

	return(node);
}

/*************************************************************************
Set the type of a dfield. */
static
void
pars_set_dfield_type(
/*=================*/
	dfield_t*	dfield,	/* in: dfield */
	pars_res_word_t* type)	/* in: pointer to a type token */
{
	if (type == &pars_int_token) {

		dtype_set(dfield_get_type(dfield), DATA_INT, 0, 4, 0);

	} else if (type == &pars_char_token) {

		dtype_set(dfield_get_type(dfield), DATA_VARCHAR,
							DATA_ENGLISH, 0, 0);
	} else {
		ut_error;
	}
}

/*************************************************************************
Parses a variable declaration. */

sym_node_t*
pars_variable_declaration(
/*======================*/
				/* out, own: symbol table node of type
				SYM_VAR */
	sym_node_t*	node,	/* in: symbol table node allocated for the
				id of the variable */
	pars_res_word_t* type)	/* in: pointer to a type token */
{
	node->resolved = TRUE;
	node->token_type = SYM_VAR;

	node->param_type = PARS_NOT_PARAM;

	pars_set_dfield_type(que_node_get_val(node), type);
	
	return(node);
}

/*************************************************************************
Parses a procedure parameter declaration. */

sym_node_t*
pars_parameter_declaration(
/*=======================*/
				/* out, own: symbol table node of type
				SYM_VAR */
	sym_node_t*	node,	/* in: symbol table node allocated for the
				id of the parameter */
	ulint		param_type,
				/* in: PARS_INPUT or PARS_OUTPUT */
	pars_res_word_t* type)	/* in: pointer to a type token */
{	
	ut_a((param_type == PARS_INPUT) || (param_type == PARS_OUTPUT));

	pars_variable_declaration(node, type);

	node->param_type = param_type;

	return(node);
}

/*************************************************************************
Sets the parent field in a query node list. */
static
void
pars_set_parent_in_list(
/*====================*/
	que_node_t*	node_list,	/* in: first node in a list */
	que_node_t*	parent)		/* in: parent value to set in all
					nodes of the list */
{
	que_common_t*	common;

	common = node_list;

	while (common) {
		common->parent = parent;

		common = que_node_get_next(common);
	}
}	

/*************************************************************************
Parses an elsif element. */

elsif_node_t*
pars_elsif_element(
/*===============*/
					/* out: elsif node */
	que_node_t*	cond,		/* in: if-condition */
	que_node_t*	stat_list)	/* in: statement list */
{
	elsif_node_t*	node;

	node = mem_heap_alloc(pars_sym_tab_global->heap, sizeof(elsif_node_t));

	node->common.type = QUE_NODE_ELSIF;

	node->cond = cond;

	pars_resolve_exp_variables_and_types(NULL, cond);
	
	node->stat_list = stat_list;

	return(node);
}

/*************************************************************************
Parses an if-statement. */

if_node_t*
pars_if_statement(
/*==============*/
					/* out: if-statement node */
	que_node_t*	cond,		/* in: if-condition */
	que_node_t*	stat_list,	/* in: statement list */
	que_node_t*	else_part)	/* in: else-part statement list
					or elsif element list */
{
	if_node_t*	node;
	elsif_node_t*	elsif_node;

	node = mem_heap_alloc(pars_sym_tab_global->heap, sizeof(if_node_t));

	node->common.type = QUE_NODE_IF;

	node->cond = cond;

	pars_resolve_exp_variables_and_types(NULL, cond);
	
	node->stat_list = stat_list;

	if (else_part && (que_node_get_type(else_part) == QUE_NODE_ELSIF)) {

		/* There is a list of elsif conditions */

		node->else_part = NULL;
		node->elsif_list = else_part;

		elsif_node = else_part;

		while (elsif_node) {
			pars_set_parent_in_list(elsif_node->stat_list, node);

			elsif_node = que_node_get_next(elsif_node);
		}
	} else {
		node->else_part = else_part;
		node->elsif_list = NULL;

		pars_set_parent_in_list(else_part, node);
	}

	pars_set_parent_in_list(stat_list, node);
	
	return(node);
}

/*************************************************************************
Parses a while-statement. */

while_node_t*
pars_while_statement(
/*=================*/
					/* out: while-statement node */
	que_node_t*	cond,		/* in: while-condition */
	que_node_t*	stat_list)	/* in: statement list */
{
	while_node_t*	node;

	node = mem_heap_alloc(pars_sym_tab_global->heap, sizeof(while_node_t));

	node->common.type = QUE_NODE_WHILE;

	node->cond = cond;

	pars_resolve_exp_variables_and_types(NULL, cond);

	node->stat_list = stat_list;

	pars_set_parent_in_list(stat_list, node);
	
	return(node);
}

/*************************************************************************
Parses a for-loop-statement. */

for_node_t*
pars_for_statement(
/*===============*/
					/* out: for-statement node */
	sym_node_t*	loop_var,	/* in: loop variable */
	que_node_t*	loop_start_limit,/* in: loop start expression */
	que_node_t*	loop_end_limit,	/* in: loop end expression */
	que_node_t*	stat_list)	/* in: statement list */
{
	for_node_t*	node;

	node = mem_heap_alloc(pars_sym_tab_global->heap, sizeof(for_node_t));

	node->common.type = QUE_NODE_FOR;

	pars_resolve_exp_variables_and_types(NULL, loop_var);
	pars_resolve_exp_variables_and_types(NULL, loop_start_limit);
	pars_resolve_exp_variables_and_types(NULL, loop_end_limit);

	node->loop_var = loop_var->indirection;

	ut_a(loop_var->indirection);

	node->loop_start_limit = loop_start_limit;
	node->loop_end_limit = loop_end_limit;

	node->stat_list = stat_list;

	pars_set_parent_in_list(stat_list, node);
	
	return(node);
}

/*************************************************************************
Parses a return-statement. */

return_node_t*
pars_return_statement(void)
/*=======================*/
					/* out: return-statement node */
{
	return_node_t*	node;

	node = mem_heap_alloc(pars_sym_tab_global->heap,
						sizeof(return_node_t));
	node->common.type = QUE_NODE_RETURN;

	return(node);
}

/*************************************************************************
Parses an assignment statement. */

assign_node_t*
pars_assignment_statement(
/*======================*/
				/* out: assignment statement node */
	sym_node_t*	var,	/* in: variable to assign */
	que_node_t*	val)	/* in: value to assign */
{
	assign_node_t*	node;

	node = mem_heap_alloc(pars_sym_tab_global->heap,
						sizeof(assign_node_t));
	node->common.type = QUE_NODE_ASSIGNMENT;

	node->var = var;
	node->val = val;

	pars_resolve_exp_variables_and_types(NULL, var);
	pars_resolve_exp_variables_and_types(NULL, val);
	
	ut_a(dtype_get_mtype(dfield_get_type(que_node_get_val(var)))
	      == dtype_get_mtype(dfield_get_type(que_node_get_val(val))));

	return(node);
}

/*************************************************************************
Parses a procedure call. */

func_node_t*
pars_procedure_call(
/*================*/
				/* out: function node */
	que_node_t*	res_word,/* in: procedure name reserved word */
	que_node_t*	args)	/* in: argument list */
{
	func_node_t*	node;

	node = pars_func(res_word, args);

	pars_resolve_exp_list_variables_and_types(NULL, args);
	
	return(node);
}

/*************************************************************************
Parses a fetch statement. */

fetch_node_t*
pars_fetch_statement(
/*=================*/
					/* out: fetch statement node */
	sym_node_t*	cursor,		/* in: cursor node */
	sym_node_t*	into_list)	/* in: variables to set */
{
	sym_node_t*	cursor_decl;
	fetch_node_t*	node;

	node = mem_heap_alloc(pars_sym_tab_global->heap, sizeof(fetch_node_t));

	node->common.type = QUE_NODE_FETCH;	
	
	pars_resolve_exp_variables_and_types(NULL, cursor);
	pars_resolve_exp_list_variables_and_types(NULL, into_list);

	node->into_list = into_list;

	cursor_decl = cursor->alias;

	ut_a(cursor_decl->token_type == SYM_CURSOR);

	node->cursor_def = cursor_decl->cursor_def;

	ut_a(que_node_list_get_len(into_list)
		== que_node_list_get_len(node->cursor_def->select_list));

	return(node);
}

/*************************************************************************
Parses an open or close cursor statement. */

open_node_t*
pars_open_statement(
/*================*/
				/* out: fetch statement node */
	ulint		type,	/* in: ROW_SEL_OPEN_CURSOR
				or ROW_SEL_CLOSE_CURSOR */
	sym_node_t*	cursor)	/* in: cursor node */
{
	sym_node_t*	cursor_decl;
	open_node_t*	node;

	node = mem_heap_alloc(pars_sym_tab_global->heap, sizeof(open_node_t));

	node->common.type = QUE_NODE_OPEN;	

	pars_resolve_exp_variables_and_types(NULL, cursor);

	cursor_decl = cursor->alias;

	ut_a(cursor_decl->token_type == SYM_CURSOR);

	node->op_type = type;
	node->cursor_def = cursor_decl->cursor_def;

	return(node);
}

/*************************************************************************
Parses a row_printf-statement. */

row_printf_node_t*
pars_row_printf_statement(
/*======================*/
					/* out: row_printf-statement node */
	sel_node_t*	sel_node)	/* in: select node */
{
	row_printf_node_t*	node;
	
	node = mem_heap_alloc(pars_sym_tab_global->heap,
						sizeof(row_printf_node_t));
	node->common.type = QUE_NODE_ROW_PRINTF;
	
	node->sel_node = sel_node;

	sel_node->common.parent = node;

	return(node);
}

/*************************************************************************
Parses a commit statement. */

commit_node_t*
pars_commit_statement(void)
/*=======================*/
{
	return(commit_node_create(pars_sym_tab_global->heap));
}

/*************************************************************************
Parses a rollback statement. */

roll_node_t*
pars_rollback_statement(void)
/*=========================*/
{
	return(roll_node_create(pars_sym_tab_global->heap));
}

/*************************************************************************
Parses a column definition at a table creation. */

sym_node_t*
pars_column_def(
/*============*/
					/* out: column sym table node */
	sym_node_t*	sym_node,	/* in: column node in the symbol
					table */
	pars_res_word_t* type)		/* in: data type */
{
	pars_set_dfield_type(que_node_get_val(sym_node), type);

	return(sym_node);
}

/*************************************************************************
Parses a table creation operation. */

tab_node_t*
pars_create_table(
/*==============*/
					/* out: table create subgraph */
	sym_node_t*	table_sym,	/* in: table name node in the symbol
					table */
	sym_node_t*	column_defs,	/* in: list of column names */
	void*		not_fit_in_memory)/* in: a non-NULL pointer means that
					this is a table which in simulations
					should be simulated as not fitting
					in memory; thread is put to sleep
					to simulate disk accesses; NOTE that
					this flag is not stored to the data
					dictionary on disk, and the database
					will forget about non-NULL value if
					it has to reload the table definition
					from disk */
{
	dict_table_t*	table;
	sym_node_t*	column;
	tab_node_t*	node;
	dtype_t*	dtype;
	ulint		n_cols;

	n_cols = que_node_list_get_len(column_defs);

	table = dict_mem_table_create(table_sym->name, 0, n_cols);
	
	if (not_fit_in_memory != NULL) {
		table->does_not_fit_in_memory = TRUE;
	}

	column = column_defs;

	while (column) {
		dtype = dfield_get_type(que_node_get_val(column));
	
		dict_mem_table_add_col(table, column->name, dtype->mtype,
						dtype->prtype, dtype->len,
						dtype->prec);
		column->resolved = TRUE;
		column->token_type = SYM_COLUMN;

		column = que_node_get_next(column);
	}
	
	node = tab_create_graph_create(table, pars_sym_tab_global->heap);

	table_sym->resolved = TRUE;
	table_sym->token_type = SYM_TABLE;
	
	return(node);
}

/*************************************************************************
Parses an index creation operation. */

ind_node_t*
pars_create_index(
/*==============*/
					/* out: index create subgraph */
	pars_res_word_t* unique_def,	/* in: not NULL if a unique index */
	pars_res_word_t* clustered_def,	/* in: not NULL if a clustered index */
	sym_node_t*	index_sym,	/* in: index name node in the symbol
					table */
	sym_node_t*	table_sym,	/* in: table name node in the symbol
					table */
	sym_node_t*	column_list)	/* in: list of column names */
{
	dict_index_t*	index;
	sym_node_t*	column;
	ind_node_t*	node;
	ulint		n_fields;
	ulint		ind_type;

	n_fields = que_node_list_get_len(column_list);

	ind_type = 0;

	if (unique_def) {
		ind_type = ind_type | DICT_UNIQUE;
	}

	if (clustered_def) {
		ind_type = ind_type | DICT_CLUSTERED;
	}
	
	index = dict_mem_index_create(table_sym->name, index_sym->name, 0,
							ind_type, n_fields);
	column = column_list;

	while (column) {
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		dict_mem_index_add_field(index, column->name, 0, 0);
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		column->resolved = TRUE;
		column->token_type = SYM_COLUMN;

		column = que_node_get_next(column);
	}
	
	node = ind_create_graph_create(index, pars_sym_tab_global->heap);

	table_sym->resolved = TRUE;
	table_sym->token_type = SYM_TABLE;

	index_sym->resolved = TRUE;
	index_sym->token_type = SYM_TABLE;

	return(node);
}

/*************************************************************************
Parses a procedure definition. */

que_fork_t*
pars_procedure_definition(
/*======================*/
					/* out: query fork node */
	sym_node_t*	sym_node,	/* in: procedure id node in the symbol
					table */
	sym_node_t*	param_list,	/* in: parameter declaration list */
	que_node_t*	stat_list)	/* in: statement list */
{
	proc_node_t*	node;
	que_fork_t*	fork;
	que_thr_t*	thr;
	mem_heap_t*	heap;

	heap = pars_sym_tab_global->heap;

	fork = que_fork_create(NULL, NULL, QUE_FORK_PROCEDURE, heap);
	fork->trx = NULL;

	thr = que_thr_create(fork, heap);

	node = mem_heap_alloc(heap, sizeof(proc_node_t));

	node->common.type = QUE_NODE_PROC;
	node->common.parent = thr;

	sym_node->token_type = SYM_PROCEDURE_NAME;
	sym_node->resolved = TRUE;
	
	node->proc_id = sym_node;
	node->param_list = param_list;
	node->stat_list = stat_list;

	pars_set_parent_in_list(stat_list, node);

	node->sym_tab = pars_sym_tab_global;

	thr->child = node;

 	pars_sym_tab_global->query_graph = fork;

	return(fork);
}

/*****************************************************************
Parses a stored procedure call, when this is not within another stored
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procedure, that is, the client issues a procedure call directly.
In MySQL/InnoDB, stored InnoDB procedures are invoked via the
parsed procedure tree, not via InnoDB SQL, so this function is not used. */
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que_fork_t*
pars_stored_procedure_call(
/*=======================*/
					/* out: query graph */
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	sym_node_t*	sym_node __attribute__((unused)))
					/* in: stored procedure name */
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{
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	ut_error;
	return(NULL);
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}

/*****************************************************************
Retrieves characters to the lexical analyzer. */

void
pars_get_lex_chars(
/*===============*/
	char*	buf,		/* in/out: buffer where to copy */
	int*	result,		/* out: number of characters copied or EOF */
	int	max_size)	/* in: maximum number of characters which fit
				in the buffer */
{
	int	len;
	
	len = pars_sym_tab_global->string_len
				- pars_sym_tab_global->next_char_pos;
	if (len == 0) {
#ifdef YYDEBUG
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		/* fputs("SQL string ends\n", stderr); */
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#endif	
		*result = 0;

		return;
	}

	if (len > max_size) {
		len = max_size;
	}

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#ifdef UNIV_SQL_DEBUG
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	if (pars_print_lexed) {
		
		if (len >= 5) {
			len = 5;
		}
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		fwrite(pars_sym_tab_global->sql_string +
			pars_sym_tab_global->next_char_pos,
			1, len, stderr);
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	}
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#endif /* UNIV_SQL_DEBUG */
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	ut_memcpy(buf, pars_sym_tab_global->sql_string +
				pars_sym_tab_global->next_char_pos, len);
	*result = len;

	pars_sym_tab_global->next_char_pos += len;
}

/*****************************************************************
Instructs the lexical analyzer to stop when it receives the EOF integer. */

int
yywrap(void)
/*========*/
		/* out: returns TRUE */
{
	return(1);
}

/*****************************************************************
Called by yyparse on error. */

void
yyerror(
/*====*/
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        char*	s __attribute__((unused))) /* in: error message string */
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{
	ut_ad(s);

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	fputs("PARSER ERROR: Syntax error in SQL string\n", stderr);
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	ut_error;
}

/*****************************************************************
Parses an SQL string returning the query graph. */

que_t*
pars_sql(
/*=====*/
			/* out, own: the query graph */
	char*	str)	/* in: SQL string */
{
	sym_node_t*	sym_node;
	mem_heap_t*	heap;
	que_t*		graph;
	ulint		len;
	char*		buf;

	ut_ad(str);

	heap = mem_heap_create(256);

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	/* Currently, the parser is not reentrant: */
	ut_ad(mutex_own(&(dict_sys->mutex)));
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#endif /* UNIV_SYNC_DEBUG */
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	pars_sym_tab_global = sym_tab_create(heap);

	len = ut_strlen(str);
	buf = mem_heap_alloc(heap, len + 1);
	ut_memcpy(buf, str, len + 1);

	pars_sym_tab_global->sql_string = buf;
	pars_sym_tab_global->string_len = len;
	pars_sym_tab_global->next_char_pos = 0;
	
	yyparse();

	sym_node = UT_LIST_GET_FIRST(pars_sym_tab_global->sym_list);

	while (sym_node) {
		ut_a(sym_node->resolved);

		sym_node = UT_LIST_GET_NEXT(sym_list, sym_node);
	}

	graph = pars_sym_tab_global->query_graph;

	graph->sym_tab = pars_sym_tab_global;

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	/* fprintf(stderr, "SQL graph size %lu\n", mem_heap_get_size(heap)); */
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	return(graph);
}

/**********************************************************************
Completes a query graph by adding query thread and fork nodes
above it and prepares the graph for running. The fork created is of
type QUE_FORK_MYSQL_INTERFACE. */

que_thr_t*
pars_complete_graph_for_exec(
/*=========================*/
				/* out: query thread node to run */
	que_node_t*	node,	/* in: root node for an incomplete
				query graph */
	trx_t*		trx,	/* in: transaction handle */
	mem_heap_t*	heap)	/* in: memory heap from which allocated */
{
	que_fork_t*	fork;
	que_thr_t*	thr;
	
	fork = que_fork_create(NULL, NULL, QUE_FORK_MYSQL_INTERFACE, heap);
	fork->trx = trx;

	thr = que_thr_create(fork, heap);

	thr->child = node;

	que_node_set_parent(node, thr);

	trx->graph = NULL;
	
	return(thr);
}