Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/8391#discussion_r39345352
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JDBCRDD.scala
---
@@ -275,6 +275,10 @@ private[sql] class JDBCRDD(
*/
private def compileFilter(f: Filter): String = f match {
case EqualTo(attr, value) => s"$attr = ${compileValue(value)}"
+ // Since the null-safe equality operator is not a standard SQL
operator,
+ // This was written as using is-null and normal equality.
+ case EqualNullSafe(attr, value) =>
+ s"($attr = ${compileValue(value)} OR ($attr IS NULL AND
${compileValue(value)} IS NULL))"
--- End diff --
Yes.. it looks so. There can be a problem if the query uses the result of
comparison `<=>`.
Let me correct this as `(NOT ($attr <> ${compileValue(value)} OR $attr IS
NULL OR ${compileValue(value)} IS NULL) OR ($attr IS NULL AND
${compileValue(value)} IS NULL))`.
(BTW, I found `<=>` actually a standard but as `IS NOT DISTINCT FROM` from
SQL1999)
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