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MDEV-13530 VARBINARY doesn't convert to to BLOB for sizes 65533, 65534 and 65535

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This commit is contained in:
Alexander Barkov
2017-10-13 07:06:09 +04:00
parent 93aadda513
commit 991b9ee735
20 changed files with 266 additions and 18 deletions
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13
sql/sql_const.h
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@ -41,7 +41,18 @@
#define MAX_MBWIDTH 3 /* Max multibyte sequence */
#define MAX_FIELD_CHARLENGTH 255
#define MAX_FIELD_VARCHARLENGTH 65535
/*
In MAX_FIELD_VARCHARLENGTH we reserve extra bytes for the overhead:
- 2 bytes for the length
- 1 byte for NULL bits
to avoid the "Row size too large" error for these three corner definitions:
CREATE TABLE t1 (c VARBINARY(65533));
CREATE TABLE t1 (c VARBINARY(65534));
CREATE TABLE t1 (c VARBINARY(65535));
Like VARCHAR(65536), they will be converted to BLOB automatically
in non-sctict mode.
*/
#define MAX_FIELD_VARCHARLENGTH (65535-2-1)
#define MAX_FIELD_BLOBLENGTH UINT_MAX32 /* cf field_blob::get_length() */
#define CONVERT_IF_BIGGER_TO_BLOB 512 /* Threshold *in characters* */