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expression: fix wrong caseWhen function for enum type (#29454) #29509

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merged 4 commits into from
Dec 20, 2021
Merged

expression: fix wrong caseWhen function for enum type (#29454) #29509

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f230012
cherry pick #29454 to release-5.0
wshwsh12 Nov 5, 2021
2729a30
resolve conflict
wshwsh12 Nov 29, 2021
6522e84
Merge remote-tracking branch 'upstream/release-5.0' into release-5.0-…
wshwsh12 Dec 20, 2021
247c674
resolve conflict
wshwsh12 Dec 20, 2021
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8 changes: 8 additions & 0 deletions expression/builtin_control.go
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Original file line number Diff line number Diff line change
Expand Up @@ -221,6 +221,14 @@ func (c *caseWhenFunctionClass) getFunction(ctx sessionctx.Context, args []Expre
return nil, err
}
bf.tp = fieldTp
if fieldTp.Tp == mysql.TypeEnum || fieldTp.Tp == mysql.TypeSet {
switch tp {
case types.ETInt:
fieldTp.Tp = mysql.TypeLonglong
case types.ETString:
fieldTp.Tp = mysql.TypeVarchar
}
}

switch tp {
case types.ETInt:
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2 changes: 1 addition & 1 deletion expression/constant_fold.go
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Expand Up @@ -140,7 +140,7 @@ func caseWhenHandler(expr *ScalarFunction) (Expression, bool) {
foldedExpr.GetType().Decimal = expr.GetType().Decimal
return foldedExpr, isDeferredConst
}
return BuildCastFunction(expr.GetCtx(), foldedExpr, foldedExpr.GetType()), isDeferredConst
return foldedExpr, isDeferredConst
}
return expr, isDeferredConst
}
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13 changes: 13 additions & 0 deletions expression/integration_test.go
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Expand Up @@ -9435,6 +9435,19 @@ func (s *testIntegrationSuite) TestControlFunctionWithEnumOrSet(c *C) {
tk.MustQuery("select elt(1,s) = 'a' from s").Check(testkit.Rows("1"))
tk.MustQuery("select elt(1,s) = 4 from s").Check(testkit.Rows("1"))
tk.MustQuery("select s from s where elt(1,s)").Check(testkit.Rows("a"))

// issue 29357
tk.MustExec("drop table if exists t;")
tk.MustExec("create table t(`a` enum('y','b','Abc','null','1','2','0')) CHARSET=binary;")
tk.MustExec("insert into t values(\"1\");")
tk.MustQuery("SELECT count(*) from t where (null like 'a') = (case when cast('2015' as real) <=> round(\"1200\",\"1\") then a end);\n").Check(testkit.Rows("0"))
tk.MustQuery("SELECT (null like 'a') = (case when cast('2015' as real) <=> round(\"1200\",\"1\") then a end) from t;\n").Check(testkit.Rows("<nil>"))
tk.MustQuery("SELECT 5 = (case when 0 <=> 0 then a end) from t;").Check(testkit.Rows("1"))
tk.MustQuery("SELECT '1' = (case when 0 <=> 0 then a end) from t;").Check(testkit.Rows("1"))
tk.MustQuery("SELECT 5 = (case when 0 <=> 1 then a end) from t;").Check(testkit.Rows("<nil>"))
tk.MustQuery("SELECT '1' = (case when 0 <=> 1 then a end) from t;").Check(testkit.Rows("<nil>"))
tk.MustQuery("SELECT 5 = (case when 0 <=> 1 then a else a end) from t;").Check(testkit.Rows("1"))
tk.MustQuery("SELECT '1' = (case when 0 <=> 1 then a else a end) from t;").Check(testkit.Rows("1"))
}

func (s *testIntegrationSuite) TestIssue29513(c *C) {
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