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MDEV-24387: Wrong number of decimal digits in certain UNION/Subqery

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constellation

Analysis: The decimals is set to NOT_FIXED_DEC for Field_str even if it is
NULL. Unsigned has decimals=0. So Type_std_attributes::decimals is set to 39
(maximum between 0 and 39). This results in incorrect number of decimals
when we have union of unsigned and NULL type.

Fix: Check if the field is created from NULL value. If yes, set decimals to 0
otherwise set it to NOT_FIXED_DEC.
This commit is contained in:
Rucha Deodhar
2021-01-12 13:31:57 +05:30
parent 59998d3480
commit fb9a9599bc
3 changed files with 53 additions and 1 deletions
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34
mysql-test/main/union.result
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@ -2601,5 +2601,39 @@ Warnings:
Note 1003 /* select#1 */ select `test`.`t2`.`a` AS `a` from `test`.`t2` where `test`.`t2`.`a` < 5 except /* select#2 */ select `test`.`t3`.`a` AS `a` from `test`.`t3` where `test`.`t3`.`a` < 5 union all /* select#3 */ select `test`.`t1`.`a` AS `a` from `test`.`t1` where `test`.`t1`.`a` > 4
drop table t1,t2,t3;
#
# MDEV-24387: Wrong number of decimal digits in certain UNION/Subqery
# constellation
#
SELECT CAST(1 AS UNSIGNED) UNION ALL SELECT * from (SELECT NULL) t;
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def CAST(1 AS UNSIGNED) 246 2 1 Y 32896 0 63
CAST(1 AS UNSIGNED)
1
NULL
SELECT CAST(1 AS SIGNED) UNION ALL SELECT * from (SELECT NULL) t;
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def CAST(1 AS SIGNED) 3 2 1 Y 32896 0 63
CAST(1 AS SIGNED)
1
NULL
SELECT CAST(1 AS SIGNED) UNION ALL SELECT * from (SELECT CAST(1 AS UNSIGNED)) t;
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def CAST(1 AS SIGNED) 246 11 1 N 32897 0 63
CAST(1 AS SIGNED)
1
1
SELECT CAST(1 AS UNSIGNED) UNION ALL SELECT NULL;
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def CAST(1 AS UNSIGNED) 246 2 1 Y 32896 0 63
CAST(1 AS UNSIGNED)
1
NULL
SELECT CAST(1 AS UNSIGNED) UNION ALL SELECT CAST(1 AS SIGNED);
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def CAST(1 AS UNSIGNED) 246 2 1 N 32897 0 63
CAST(1 AS UNSIGNED)
1
1
#
# End of 10.3 tests
#