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executor: fix unexpected NotNullFlag in case when expr ret type #23102

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merged 7 commits into from
Mar 5, 2021
Merged

executor: fix unexpected NotNullFlag in case when expr ret type #23102

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cec088b
executor: fix unexpected NotNullFlag in case when expr ret type
guo-shaoge Mar 4, 2021
9485bc2
fix comment typo
guo-shaoge Mar 4, 2021
44bb13c
add comment for exported function
guo-shaoge Mar 4, 2021
7bfc7bc
fix exported function comment.
guo-shaoge Mar 4, 2021
faadae1
Merge branch 'master' into issue-23036
guo-shaoge Mar 4, 2021
4bd7706
Merge branch 'master' into issue-23036
ti-chi-bot Mar 5, 2021
0ec0dc6
Merge branch 'master' into issue-23036
ti-chi-bot Mar 5, 2021
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3 changes: 3 additions & 0 deletions expression/builtin_control.go
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,9 @@ func (c *caseWhenFunctionClass) getFunction(ctx sessionctx.Context, args []Expre
}

fieldTp := types.AggFieldType(fieldTps)
// Here we turn off NotNullFlag. Because if all when-clauses are false,
// the result of case-when expr is NULL.
types.SetTypeFlag(&fieldTp.Flag, mysql.NotNullFlag, false)
tp := fieldTp.EvalType()

if tp == types.ETInt {
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10 changes: 10 additions & 0 deletions expression/integration_test.go
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Expand Up @@ -2961,6 +2961,16 @@ func (s *testIntegrationSuite2) TestBuiltin(c *C) {
result.Check(testkit.Rows("<nil> 4"))
result = tk.MustQuery("select * from t where b = case when a is null then 4 when a = 'str5' then 7 else 9 end")
result.Check(testkit.Rows("<nil> 4"))

// return type of case when expr should not include NotNullFlag. issue-23036
tk.MustExec("drop table if exists t1")
tk.MustExec("create table t1(c1 int not null)")
tk.MustExec("insert into t1 values(1)")
result = tk.MustQuery("select (case when null then c1 end) is null from t1")
result.Check(testkit.Rows("1"))
result = tk.MustQuery("select (case when null then c1 end) is not null from t1")
result.Check(testkit.Rows("0"))

// test warnings
tk.MustQuery("select case when b=0 then 1 else 1/b end from t")
tk.MustQuery("show warnings").Check(testkit.Rows())
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7 changes: 4 additions & 3 deletions types/field_type.go
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Expand Up @@ -134,8 +134,8 @@ func AggregateEvalType(fts []*FieldType, flag *uint) EvalType {
}
lft = rft
}
setTypeFlag(flag, mysql.UnsignedFlag, unsigned)
setTypeFlag(flag, mysql.BinaryFlag, !aggregatedEvalType.IsStringKind() || gotBinString)
SetTypeFlag(flag, mysql.UnsignedFlag, unsigned)
SetTypeFlag(flag, mysql.BinaryFlag, !aggregatedEvalType.IsStringKind() || gotBinString)
return aggregatedEvalType
}

Expand All @@ -160,7 +160,8 @@ func mergeEvalType(lhs, rhs EvalType, lft, rft *FieldType, isLHSUnsigned, isRHSU
return ETInt
}

func setTypeFlag(flag *uint, flagItem uint, on bool) {
// SetTypeFlag turns the flagItem on or off.
func SetTypeFlag(flag *uint, flagItem uint, on bool) {
if on {
*flag |= flagItem
} else {
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