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planner, executor: fix tp.Flen size when union with castIntAsString (#8442) #8490

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merged 3 commits into from
Nov 28, 2018
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planner, executor: fix tp.Flen size when union with castIntAsString (#8442) #8490

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a93ce4f
planner, executor: fix tp.Flen size when union with castIntAsString
AndrewDi Nov 28, 2018
cdc4f8d
Merge branch 'release-2.1' into release-2.1-#8442
zz-jason Nov 28, 2018
832af62
Merge branch 'release-2.1' into release-2.1-#8442
ngaut Nov 28, 2018
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6 changes: 6 additions & 0 deletions executor/executor_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1065,6 +1065,12 @@ func (s *testSuite) TestUnion(c *C) {
for i := 0; i < 4; i++ {
tk.MustQuery("SELECT(SELECT 0 AS a FROM dual UNION SELECT 1 AS a FROM dual ORDER BY a ASC LIMIT 1) AS dev").Check(testkit.Rows("0"))
}

// #issue 8231
tk.MustExec("drop table if exists t1")
tk.MustExec("CREATE TABLE t1 (uid int(1))")
tk.MustExec("INSERT INTO t1 SELECT 150")
tk.MustQuery("SELECT 'a' UNION SELECT uid FROM t1 order by 1 desc;").Check(testkit.Rows("a", "150"))
}

func (s *testSuite) TestNeighbouringProj(c *C) {
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3 changes: 3 additions & 0 deletions planner/core/logical_plan_builder.go
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Expand Up @@ -640,6 +640,9 @@ func unionJoinFieldType(a, b *types.FieldType) *types.FieldType {
resultTp.Decimal = mathutil.Max(a.Decimal, b.Decimal)
// `Flen - Decimal` is the fraction before '.'
resultTp.Flen = mathutil.Max(a.Flen-a.Decimal, b.Flen-b.Decimal) + resultTp.Decimal
if resultTp.EvalType() != types.ETInt && (a.EvalType() == types.ETInt || b.EvalType() == types.ETInt) && resultTp.Flen < mysql.MaxIntWidth {
resultTp.Flen = mysql.MaxIntWidth
}
resultTp.Charset = a.Charset
resultTp.Collate = a.Collate
expression.SetBinFlagOrBinStr(b, resultTp)
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