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MCOL-4823 WHERE char_col<varchar_col returns a wrong result of a large table (#2060)

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SCommand StrFilterCmd::duplicate() missed these two lines:

    filterCmd->leftColType = leftColType;
    filterCmd->rightColType = rightColType;

which exist in the parent's FilterCommand::duplicate().

Rewriting the code to avoid duplication by using more inherited
methods/constructors. This reduces the probability of similar bugs
in the future.
This commit is contained in:
Alexander Barkov
2021-08-03 12:53:05 +04:00
committed by GitHub
parent dffef34c78
commit c16b0f6ad7
10 changed files with 161 additions and 45 deletions
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80
mysql-test/columnstore/basic/r/type_string.result Normal file
View File

@ -0,0 +1,80 @@
DROP DATABASE IF EXISTS mcs_type_string;
CREATE DATABASE mcs_type_string;
#
# MCOL-4823 WHERE char_col<varchar_col returns a wrong result of a large table
#
CREATE TABLE t1
(
l_returnflag char(1) CHARACTER SET latin1 COLLATE latin1_bin,
l_shipinstruct char(25) CHARACTER SET latin1 COLLATE latin1_bin,
l_comment varchar(44) CHARACTER SET latin1 COLLATE latin1_bin
) ENGINE=MyISAM;
BEGIN NOT ATOMIC
DECLARE ins TEXT DEFAULT 'INSERT INTO t1 VALUES <rows>';
DECLARE onerow TEXT DEFAULT '(''a'',''aaaa'',''AAAA'')';
DECLARE rows256 TEXT DEFAULT CONCAT(REPEAT(CONCAT(onerow, ','), 255), onerow);
-- The problem was repeatable with at least 122881 records
-- For faster data loading, insert 256 records at a time 480 times
-- That gives 480*256=122880 records
FOR i IN 1..480
DO
EXECUTE IMMEDIATE REPLACE(ins, '<rows>', rows256);
END FOR;
-- Now insert one more record to make 122881 records
EXECUTE IMMEDIATE REPLACE(ins, '<rows>', onerow);
END
$$
SELECT count(*) FROM t1 WHERE l_comment < l_shipinstruct;
count(*)
122881
SELECT count(*) FROM t1 WHERE l_comment <= l_shipinstruct;
count(*)
122881
SELECT count(*) FROM t1 WHERE l_comment >= l_shipinstruct;
count(*)
0
SELECT count(*) FROM t1 WHERE l_comment > l_shipinstruct;
count(*)
0
SELECT count(*) FROM t1 WHERE l_shipinstruct < l_comment;
count(*)
0
SELECT count(*) FROM t1 WHERE l_shipinstruct <= l_comment;
count(*)
0
SELECT count(*) FROM t1 WHERE l_shipinstruct >= l_comment;
count(*)
122881
SELECT count(*) FROM t1 WHERE l_shipinstruct > l_comment;
count(*)
122881
CREATE TABLE t2 LIKE t1;
ALTER TABLE t2 ENGINE=ColumnStore;
INSERT INTO t2 SELECT * FROM t1;
SELECT count(*) FROM t2 WHERE l_comment < l_shipinstruct;
count(*)
122881
SELECT count(*) FROM t2 WHERE l_comment <= l_shipinstruct;
count(*)
122881
SELECT count(*) FROM t2 WHERE l_comment >= l_shipinstruct;
count(*)
0
SELECT count(*) FROM t2 WHERE l_comment > l_shipinstruct;
count(*)
0
SELECT count(*) FROM t2 WHERE l_shipinstruct < l_comment;
count(*)
0
SELECT count(*) FROM t2 WHERE l_shipinstruct <= l_comment;
count(*)
0
SELECT count(*) FROM t2 WHERE l_shipinstruct >= l_comment;
count(*)
122881
SELECT count(*) FROM t2 WHERE l_shipinstruct > l_comment;
count(*)
122881
DROP TABLE t2;
DROP TABLE t1;
DROP DATABASE mcs_type_string;