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This was developed by Aleksey Midenkov based on my design. In the original InnoDB storage format (that was retroactively named ROW_FORMAT=REDUNDANT in MySQL 5.0.3), the length of each index field is stored explicitly. Because of this, we can and now will allow instant conversion from VARCHAR to CHAR or VARBINARY to BINARY of equal or greater size, as well as instant conversion of TINYINT to SMALLINT to MEDIUMINT to INT to BIGINT (while not changing between signed and unsigned). Theoretically, we could allow changing from an unsigned integer to a bigger unsigned integer, as well as changing CHAR to VARCHAR, but that would require additional metadata and conversions whenever reading old records. Field_str::is_equal(), Field_varstring::is_equal(), Field_num::is_equal(): Return the new result IS_EQUAL_PACK_LENGTH_EXT if the table advertises HA_EXTENDED_TYPES_CONVERSION capability and we are considering the above-mentioned conversions. ALTER_COLUMN_EQUAL_PACK_LENGTH_EXT: A new ALTER TABLE flag, similar to ALTER_COLUMN_EQUAL_PACK_LENGTH but requiring conversions when reading the data. The Field::is_equal() result IS_EQUAL_PACK_LENGTH_EXT will map to this flag. dtype_get_fixed_size_low(): For BINARY, CHAR and integer columns in ROW_FORMAT=REDUNDANT, return 0 (variable length) from now on. dtype_get_sql_null_size(): Keep returning the current size for BINARY, CHAR and integer columns, so that in ROW_FORMAT=REDUNDANT it will remain possible to update in place between NULL and NOT NULL values. btr_index_rec_validate(): Relax a CHECK TABLE length check for ROW_FORMAT=REDUNDANT tables. btr_cur_instant_init_low(): No longer trust fixed_len for ROW_FORMAT=REDUNDANT tables. We cannot rely on fixed_len anymore because the record can have shorter length from before instant extension. Note that importing such tablespace into earlier MariaDB versions produces ER_TABLE_SCHEMA_MISMATCH when using a .cfg file.
5 lines
71 B
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5 lines
71 B
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character-set-server=latin1
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[utf8]
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character-set-server=utf8
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