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[Spark-13772][SQL] fix data type mismatch for decimal #11605

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[Spark-13772][SQL] fix data type mismatch for decimal #11605

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5236dcb
temp patch for SPARK-13566
cenyuhai Mar 6, 2016
8d539df
fix data type mismatch for decimal
cenyuhai Mar 9, 2016
42addd6
rebase to branch 1.6
cenyuhai Mar 9, 2016
90cf309
fix scala style
cenyuhai Mar 17, 2016
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fix data type mismatch for decimal
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@cenyuhai
cenyuhai committed Mar 9, 2016
commit 8d539df190a21e7d3d93ab078866267ece2f1df0
2 changes: 1 addition & 1 deletion sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -677,7 +677,7 @@ object HiveTypeCoercion {
case e if !e.childrenResolved => e
// Find tightest common type for If, if the true value and false value have different types.
case i @ If(pred, left, right) if left.dataType != right.dataType =>
findTightestCommonTypeToString(left.dataType, right.dataType).map { widestType =>
findWiderTypeForTwo(left.dataType, right.dataType).map { widestType =>
val newLeft = if (left.dataType == widestType) left else Cast(left, widestType)
val newRight = if (right.dataType == widestType) right else Cast(right, widestType)
If(pred, newLeft, newRight)
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13 changes: 13 additions & 0 deletions ...atalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercionSuite.scala
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Expand Up @@ -299,6 +299,19 @@ class HiveTypeCoercionSuite extends PlanTest {
)
}

test("test for SPARK-13772") {
val rule = HiveTypeCoercion.IfCoercion
ruleTest(rule,
If(Literal(true), Literal(1.0), Cast(Literal(1.0), DecimalType(19, 0))),
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@cloud-fan cloud-fan Mar 9, 2016

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Can you also check it with other database systems like Hive? Do they allow double type and decimal type in if and else branches?

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@cenyuhai cenyuhai Mar 10, 2016

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@cloud-fan It is ok in hive 1.2.1 and spark 1.4.1.
test case:
select if(1=1, cast(1 as double), cast(1 as decimal)) from test

If(Literal(true), Literal(1.0), Cast(Cast(Literal(1.0), DecimalType(19, 0)), DoubleType))
)

ruleTest(rule,
If(Literal(true), Literal(Decimal(1)), Cast(Literal(1.0), DecimalType(19, 9))),
If(Literal(true), Cast(Literal(Decimal(1)), DecimalType(19, 9)), Cast(Literal(1.0), DecimalType(19, 9)))
)
}

test("type coercion for CaseKeyWhen") {
ruleTest(HiveTypeCoercion.CaseWhenCoercion,
CaseKeyWhen(Literal(1.toShort), Seq(Literal(1), Literal("a"))),
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