MDEV-19727 Add Type_handler::Key_part_spec_init_ft

mysql-test/main/column_compression.result

@@ -1486,3 +1486,19 @@ WHERE TABLE_SCHEMA='test' AND TABLE_NAME='t1';
 COLUMN_TYPE
 varchar(1000) /*!100301 COMPRESSED*/
 DROP TABLE t1;
+#
+# End of 10.3 tests
+#
+#
+# Start of 10.5 tests
+#
+#
+# MDEV-19727 Add Type_handler::Key_part_spec_init_ft
+#
+CREATE TABLE t1 (a VARCHAR(1000) COMPRESSED, FULLTEXT INDEX(a));
+ERROR HY000: Compressed column 'a' can't be used in key specification
+CREATE TABLE t1 (a TEXT COMPRESSED, FULLTEXT INDEX(a));
+ERROR HY000: Compressed column 'a' can't be used in key specification
+#
+# End of 10.5 tests
+#

mysql-test/main/column_compression.test

@@ -181,3 +181,32 @@ SHOW CREATE TABLE t1;
 SELECT COLUMN_TYPE FROM INFORMATION_SCHEMA.COLUMNS
 WHERE TABLE_SCHEMA='test' AND TABLE_NAME='t1';
 DROP TABLE t1;
+
+--echo #
+--echo # End of 10.3 tests
+--echo #
+
+
+--echo #
+--echo # Start of 10.5 tests
+--echo #
+
+--echo #
+--echo # MDEV-19727 Add Type_handler::Key_part_spec_init_ft
+--echo #
+
+#
+# Indexes on COMPRESSED columns are generally prohibited, so we don't have
+# to override Type_handler_xxx_compressed::Key_part_spec_init_ft().
+# Note, we could support FULLTEXT indexes on compressed columns eventually.
+#
+
+--error ER_COMPRESSED_COLUMN_USED_AS_KEY
+CREATE TABLE t1 (a VARCHAR(1000) COMPRESSED, FULLTEXT INDEX(a));
+
+--error ER_COMPRESSED_COLUMN_USED_AS_KEY
+CREATE TABLE t1 (a TEXT COMPRESSED, FULLTEXT INDEX(a));
+
+--echo #
+--echo # End of 10.5 tests
+--echo #

mysql-test/main/type_varchar.result

@@ -723,3 +723,32 @@ SET sql_mode=DEFAULT;
 #
 # End of 10.4 tests
 #
+#
+# Start of 10.5 tests
+#
+#
+# MDEV-15592 Column COMPRESSED should select a 'high order' datatype
+#
+TRUNCATE TABLE vchar;
+SHOW CREATE TABLE vchar;
+Table	Create Table
+vchar	CREATE TABLE `vchar` (
+  `v` varchar(30)/*old*/ DEFAULT NULL,
+  `c` char(3) DEFAULT NULL,
+  `e` enum('abc','def','ghi') DEFAULT NULL,
+  `t` text DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+ALTER TABLE vchar ADD FULLTEXT INDEX(v);
+SHOW CREATE TABLE vchar;
+Table	Create Table
+vchar	CREATE TABLE `vchar` (
+  `v` varchar(30) DEFAULT NULL,
+  `c` char(3) DEFAULT NULL,
+  `e` enum('abc','def','ghi') DEFAULT NULL,
+  `t` text DEFAULT NULL,
+  FULLTEXT KEY `v` (`v`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+DROP TABLE vchar;
+#
+# End of 10.5 tests
+#

mysql-test/main/type_varchar.test

@@ -359,3 +359,26 @@ SET sql_mode=DEFAULT;
 --echo #
 --echo # End of 10.4 tests
 --echo #
+
+--echo #
+--echo # Start of 10.5 tests
+--echo #
+
+--echo #
+--echo # MDEV-15592 Column COMPRESSED should select a 'high order' datatype
+--echo #
+
+#
+# Old VARCHAR is automatically upgraded to new VARCHAR.
+# So we don't have to override Type_handler_var_string::Key_part_spec_init_ft()
+#
+copy_file $MYSQL_TEST_DIR/std_data/vchar.frm $MYSQLD_DATADIR/test/vchar.frm;
+TRUNCATE TABLE vchar;
+SHOW CREATE TABLE vchar;
+ALTER TABLE vchar ADD FULLTEXT INDEX(v);
+SHOW CREATE TABLE vchar;
+DROP TABLE vchar;
+
+--echo #
+--echo # End of 10.5 tests
+--echo #

sql/sql_string.h

@@ -138,6 +138,11 @@ class Charset
   CHARSET_INFO *charset() const { return m_charset; }
   uint mbminlen() const { return m_charset->mbminlen; }
   uint mbmaxlen() const { return m_charset->mbmaxlen; }
+  bool is_good_for_ft() const
+  {
+    // Binary and UCS2/UTF16/UTF32 are not supported
+    return m_charset != &my_charset_bin && m_charset->mbminlen == 1;
+  }
 
   size_t numchars(const char *str, const char *end) const
   {

sql/sql_table.cc

@@ -3361,6 +3361,45 @@ mysql_add_invisible_index(THD *thd, List<Key> *key_list,
   key_list->push_back(key, thd->mem_root);
   return key;
 }
+
+
+bool Type_handler_string::Key_part_spec_init_ft(Key_part_spec *part,
+                                                const Column_definition &def)
+                                                const
+{
+  /*
+    Set length to 0. It's set to the real column width later for CHAR.
+    It has to be the correct col width for CHAR, as its data are not
+    prefixed with length (unlike blobs).
+  */
+  part->length= 0;
+  return !Charset(def.charset).is_good_for_ft();
+}
+
+
+bool Type_handler_varchar::Key_part_spec_init_ft(Key_part_spec *part,
+                                                 const Column_definition &def)
+                                                 const
+{
+  part->length= 0;
+  return !Charset(def.charset).is_good_for_ft();
+}
+
+
+bool
+Type_handler_blob_common::Key_part_spec_init_ft(Key_part_spec *part,
+                                                const Column_definition &def)
+                                                const
+{
+  /*
+    Set keyseg length to 1 for blobs.
+    It's ignored in ft code: the data length is taken from the length prefix.
+  */
+  part->length= 1;
+  return !Charset(def.charset).is_good_for_ft();
+}
+
+
 /*
   Preparation for table creation
 
@@ -3894,28 +3933,18 @@ mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info,
       cols2.rewind();
       if (key->type == Key::FULLTEXT)
       {
-	if ((sql_field->real_field_type() != MYSQL_TYPE_STRING &&
-	     sql_field->real_field_type() != MYSQL_TYPE_VARCHAR &&
-	     !f_is_blob(sql_field->pack_flag)) ||
-	    sql_field->charset == &my_charset_bin ||
-	    sql_field->charset->mbminlen > 1 || // ucs2 doesn't work yet
-	    (ft_key_charset && sql_field->charset != ft_key_charset))
-	{
-	    my_error(ER_BAD_FT_COLUMN, MYF(0), column->field_name.str);
-	    DBUG_RETURN(-1);
-	}
-	ft_key_charset=sql_field->charset;
-	/*
-	  for fulltext keys keyseg length is 1 for blobs (it's ignored in ft
-	  code anyway, and 0 (set to column width later) for char's. it has
-	  to be correct col width for char's, as char data are not prefixed
-	  with length (unlike blobs, where ft code takes data length from a
-	  data prefix, ignoring column->length).
-	*/
-        column->length= MY_TEST(f_is_blob(sql_field->pack_flag));
+        if (sql_field->type_handler()->Key_part_spec_init_ft(column,
+	                                                     *sql_field) ||
+            (ft_key_charset && sql_field->charset != ft_key_charset))
+        {
+          my_error(ER_BAD_FT_COLUMN, MYF(0), column->field_name.str);
+          DBUG_RETURN(-1);
+        }
+        ft_key_charset=sql_field->charset;
       }
       else
       {
+
 	column->length*= sql_field->charset->mbmaxlen;
 
         if (key->type == Key::SPATIAL)

sql/sql_type.h

@@ -34,6 +34,7 @@ C_MODE_END
 class Field;
 class Column_definition;
 class Column_definition_attributes;
+class Key_part_spec;
 class Item;
 class Item_const;
 class Item_literal;
@@ -3456,6 +3457,11 @@ class Type_handler
   virtual bool Column_definition_prepare_stage2(Column_definition *c,
                                                 handler *file,
                                                 ulonglong table_flags) const= 0;
+  virtual bool Key_part_spec_init_ft(Key_part_spec *part,
+                                     const Column_definition &def) const
+  {
+    return true; // Error
+  }
   virtual Field *make_table_field(const LEX_CSTRING *name,
                                   const Record_addr &addr,
                                   const Type_all_attributes &attr,
@@ -6002,6 +6008,8 @@ class Type_handler_string: public Type_handler_longstr
   bool Column_definition_prepare_stage2(Column_definition *c,
                                         handler *file,
                                         ulonglong table_flags) const;
+  bool Key_part_spec_init_ft(Key_part_spec *part,
+                             const Column_definition &def) const;
   Field *make_table_field(const LEX_CSTRING *name,
                           const Record_addr &addr,
                           const Type_all_attributes &attr,
@@ -6084,6 +6092,8 @@ class Type_handler_varchar: public Type_handler_longstr
   bool Column_definition_prepare_stage2(Column_definition *c,
                                         handler *file,
                                         ulonglong table_flags) const;
+  bool Key_part_spec_init_ft(Key_part_spec *part,
+                             const Column_definition &def) const;
   Field *make_table_field(const LEX_CSTRING *name,
                           const Record_addr &addr,
                           const Type_all_attributes &attr,
@@ -6157,6 +6167,8 @@ class Type_handler_blob_common: public Type_handler_longstr
   bool Column_definition_prepare_stage2(Column_definition *c,
                                         handler *file,
                                         ulonglong table_flags) const;
+  bool Key_part_spec_init_ft(Key_part_spec *part,
+                             const Column_definition &def) const;
   bool Item_hybrid_func_fix_attributes(THD *thd,
                                        const char *name,
                                        Type_handler_hybrid_field_type *,