Alexander Barkov 6426b52ed4 MDEV-15957 Unexpected "Data too long" when doing CREATE..SELECT with stored func ... Problems: 1. Unlike Item_field::fix_fields(), Item_sum_sp::fix_length_and_dec() and Item_func_sp::fix_length_and_dec() did not run the code which resided in adjust_max_effective_column_length(), therefore they did not extend max_length for the integer return data types from the user-specified length to the maximum length according to the data type capacity. 2. The code in adjust_max_effective_column_length() was not correct for TEXT data, because Field_blob::max_display_length() multiplies to mbmaxlen. So TEXT variants were unintentionally promoted to the next longer data type for multi-byte character sets: TINYTEXT->TEXT, TEXT->MEDIUMTEXT, MEDIUMTEXT->LONGTEXT. 3. Item_sum_sp::create_table_field_from_handler() Item_func_sp::create_table_field_from_handler() erroneously called tmp_table_field_from_field_type(), which converted VARCHAR(>512) to TEXT variants. So "CREATE..SELECT spfunc()" erroneously converted VARCHAR to TEXT. This was wrong, because stored functions have explicitly declared data types, which should be preserved. Solution: - Removing Type_std_attributes(const Field *) and using instead Type_std_attributes::set() in combination with field->type_str_attributes() all around the code, e.g.: Type_std_attributes::set(field->type_std_attributes()) These two ways of copying attributes from a Field to an Item duplicated each other, and were slightly different in how to mix max_length and mbmaxlen. - Removing adjust_max_effective_column_length() and fixing Field::type_std_attributes() to do all necessary type-specific calculations , so no further adjustments is needed. Field::type_std_attributes() is now called from all affected methods: Item_field::fix_fields() Item_sum_sp::fix_length_and_dec() Item_func_sp::fix_length_and_dec() This fixes the problem N1. - Making Field::type_std_attributes() virtual, to make sure that type-specific adjustments a properly done by individual Field_xxx classes. Implementing Field_blob::type_std_attributes() in the way that no TEXT promotion is done. This fixes the problem N2. - Fixing Item_sum_sp::create_table_field_from_handler() Item_func_sp::create_table_field_from_handler() to call create_table_field_from_handler() instead of tmp_table_field_from_field_type() to avoid VARCHAR->TEXT conversion on "CREATE..SELECT spfunc()". - Recording mysql-test/suite/compat/oracle/r/sp-param.result as "CREATE..SELECT spfunc()" now correctly preserve the data type as specified in the RETURNS clause. - Adding new tests		2018-04-23 09:31:17 +04:00
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r	MDEV-15957 Unexpected "Data too long" when doing CREATE..SELECT with stored func	2018-04-23 09:31:17 +04:00
t	Adding more tests for IN/EXIST subqueries for better coverage	2018-04-20 23:15:27 +04:00