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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