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[SPARK-23986][SQL] freshName can generate non-unique names #21080

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[SPARK-23986][SQL] freshName can generate non-unique names #21080

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8623918
[SPARK-23986][SQL] freshName can generate non-unique names
mgaido91 Apr 16, 2018
58f72ae
fix a and a_1 conflict
mgaido91 Apr 17, 2018
0993827
review comments
mgaido91 Apr 17, 2018
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4 changes: 2 additions & 2 deletions ...lyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -575,10 +575,10 @@ class CodegenContext {
if (freshNameIds.contains(fullName)) {
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@cloud-fan cloud-fan Apr 17, 2018

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now we don't need this if

val id = freshNameIds.getOrElse(fullName, 0)
val res = s"${fullName}_$id"
freshNameIds(fullName) = id + 1
res

val id = freshNameIds(fullName)
freshNameIds(fullName) = id + 1
s"$fullName$id"
s"${fullName}_$id"
} else {
freshNameIds += fullName -> 1
fullName
s"${fullName}_0"
}
}

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10 changes: 10 additions & 0 deletions ...talyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CodeGenerationSuite.scala
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Expand Up @@ -489,4 +489,14 @@ class CodeGenerationSuite extends SparkFunSuite with ExpressionEvalHelper {
assert(!ctx.subExprEliminationExprs.contains(ref))
}
}

test("SPARK-23986: freshName can generate duplicated names") {
val ctx = new CodegenContext
val names1 = ctx.freshName("myName1") :: ctx.freshName("myName1") ::
ctx.freshName("myName11") :: Nil
assert(names1.distinct.length == 3)
val names2 = ctx.freshName("a") :: ctx.freshName("a") ::
ctx.freshName("a_1") :: ctx.freshName("a_0") :: Nil
assert(names2.distinct.length == 4)
}
}