MDEV-6424: MariaDB server crashes with assertion failure in file ha_innodb.c line 11652

This is not a fix, this is instrumentation to find out is MySQL frm dictionary
and InnoDB data dictionary really out-of-sync when this assertion is fired,
or is there some other reason (bug).

storage/innobase/handler/ha_innodb.cc

@@ -1998,11 +1998,16 @@ innobase_get_stmt(
 	THD*	thd,		/*!< in: MySQL thread handle */
 	size_t*	length)		/*!< out: length of the SQL statement */
 {
-	LEX_STRING* stmt;
-
-	stmt = thd_query_string(thd);
-	*length = stmt->length;
-	return(stmt->str);
+	const char* query = NULL;
+	LEX_STRING *stmt = NULL;
+	if (thd) {
+		stmt = thd_query_string(thd);
+		if (stmt) {
+			*length = stmt->length;
+			query = stmt->str;
+		}
+	}
+	return (query);
 }
 
 /**********************************************************************//**
@@ -6616,7 +6621,66 @@ build_template_field(
 	UNIV_MEM_INVALID(templ, sizeof *templ);
 	templ->col_no = i;
 	templ->clust_rec_field_no = dict_col_get_clust_pos(col, clust_index);
-	ut_a(templ->clust_rec_field_no != ULINT_UNDEFINED);
+
+	/* If clustered index record field is not found, lets print out
+	field names and all the rest to understand why field is not found. */
+	if (templ->clust_rec_field_no == ULINT_UNDEFINED) {
+		const char* tb_col_name = dict_table_get_col_name(clust_index->table, i);
+		dict_field_t* field=NULL;
+		size_t size = 0;
+
+		for(ulint j=0; j < clust_index->n_user_defined_cols; j++) {
+			dict_field_t* ifield = &(clust_index->fields[j]);
+			if (ifield && !memcmp(tb_col_name, ifield->name,
+					strlen(tb_col_name))) {
+				field = ifield;
+				break;
+			}
+		}
+
+		ib_logf(IB_LOG_LEVEL_INFO,
+			"Looking for field %lu name %s from table %s",
+			i,
+			(tb_col_name ? tb_col_name : "NULL"),
+			clust_index->table->name);
+
+
+		for(ulint j=0; j < clust_index->n_user_defined_cols; j++) {
+			dict_field_t* ifield = &(clust_index->fields[j]);
+			ib_logf(IB_LOG_LEVEL_INFO,
+				"InnoDB Table %s field %lu name %s",
+				clust_index->table->name,
+				j,
+				(ifield ? ifield->name : "NULL"));
+		}
+
+		for(ulint j=0; j < table->s->stored_fields; j++) {
+			ib_logf(IB_LOG_LEVEL_INFO,
+				"MySQL table %s field %lu name %s",
+				table->s->table_name.str,
+				j,
+				table->field[j]->field_name);
+		}
+
+		ib_logf(IB_LOG_LEVEL_ERROR,
+			"Clustered record field for column %lu"
+			" not found table n_user_defined %d"
+			" index n_user_defined %d"
+			" InnoDB table %s field name %s"
+			" MySQL table %s field name %s n_fields %d"
+			" query %s",
+			i,
+			clust_index->n_user_defined_cols,
+			clust_index->table->n_cols - DATA_N_SYS_COLS,
+			clust_index->table->name,
+			(field ? field->name : "NULL"),
+			table->s->table_name.str,
+			(tb_col_name ? tb_col_name : "NULL"),
+			table->s->stored_fields,
+			innobase_get_stmt(current_thd, &size));
+
+		ut_a(templ->clust_rec_field_no != ULINT_UNDEFINED);
+	}
 
 	if (dict_index_is_clust(index)) {
 		templ->rec_field_no = templ->clust_rec_field_no;

storage/xtradb/handler/ha_innodb.cc

@@ -2355,11 +2355,16 @@ innobase_get_stmt(
 	THD*	thd,		/*!< in: MySQL thread handle */
 	size_t*	length)		/*!< out: length of the SQL statement */
 {
-	LEX_STRING* stmt;
-
-	stmt = thd_query_string(thd);
-	*length = stmt->length;
-	return(stmt->str);
+	const char* query = NULL;
+	LEX_STRING *stmt = NULL;
+	if (thd) {
+		stmt = thd_query_string(thd);
+		if (stmt) {
+			*length = stmt->length;
+			query = stmt->str;
+		}
+	}
+	return (query);
 }
 
 /**********************************************************************//**
@@ -7517,7 +7522,66 @@ build_template_field(
 	UNIV_MEM_INVALID(templ, sizeof *templ);
 	templ->col_no = i;
 	templ->clust_rec_field_no = dict_col_get_clust_pos(col, clust_index);
-	ut_a(templ->clust_rec_field_no != ULINT_UNDEFINED);
+
+	/* If clustered index record field is not found, lets print out
+	field names and all the rest to understand why field is not found. */
+	if (templ->clust_rec_field_no == ULINT_UNDEFINED) {
+		const char* tb_col_name = dict_table_get_col_name(clust_index->table, i);
+		dict_field_t* field=NULL;
+		size_t size = 0;
+
+		for(ulint j=0; j < clust_index->n_user_defined_cols; j++) {
+			dict_field_t* ifield = &(clust_index->fields[j]);
+			if (ifield && !memcmp(tb_col_name, ifield->name,
+					strlen(tb_col_name))) {
+				field = ifield;
+				break;
+			}
+		}
+
+		ib_logf(IB_LOG_LEVEL_INFO,
+			"Looking for field %lu name %s from table %s",
+			i,
+			(tb_col_name ? tb_col_name : "NULL"),
+			clust_index->table->name);
+
+
+		for(ulint j=0; j < clust_index->n_user_defined_cols; j++) {
+			dict_field_t* ifield = &(clust_index->fields[j]);
+			ib_logf(IB_LOG_LEVEL_INFO,
+				"InnoDB Table %s field %lu name %s",
+				clust_index->table->name,
+				j,
+				(ifield ? ifield->name : "NULL"));
+		}
+
+		for(ulint j=0; j < table->s->stored_fields; j++) {
+			ib_logf(IB_LOG_LEVEL_INFO,
+				"MySQL table %s field %lu name %s",
+				table->s->table_name.str,
+				j,
+				table->field[j]->field_name);
+		}
+
+		ib_logf(IB_LOG_LEVEL_ERROR,
+			"Clustered record field for column %lu"
+			" not found table n_user_defined %d"
+			" index n_user_defined %d"
+			" InnoDB table %s field name %s"
+			" MySQL table %s field name %s n_fields %d"
+			" query %s",
+			i,
+			clust_index->n_user_defined_cols,
+			clust_index->table->n_cols - DATA_N_SYS_COLS,
+			clust_index->table->name,
+			(field ? field->name : "NULL"),
+			table->s->table_name.str,
+			(tb_col_name ? tb_col_name : "NULL"),
+			table->s->stored_fields,
+			innobase_get_stmt(current_thd, &size));
+
+		ut_a(templ->clust_rec_field_no != ULINT_UNDEFINED);
+	}
 
 	if (dict_index_is_clust(index)) {
 		templ->rec_field_no = templ->clust_rec_field_no;