andrej-db commented on code in PR #48621:
URL: https://github.com/apache/spark/pull/48621#discussion_r1813204684
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sql/core/src/main/scala/org/apache/spark/sql/jdbc/MsSqlServerDialect.scala:
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@@ -73,6 +73,36 @@ private case class MsSqlServerDialect() extends JdbcDialect
with NoLegacyJDBCErr
}
}
+ override def visitCaseWhen(children: Array[String]): String = {
+ // Since MsSqlServer cannot handle boolean expressions inside
+ // a CASE WHEN, it is necessary to convert those to an IIF
+ // expression that will return 1 or 0 depending on the result.
+ // Example:
+ // In: ... CASE WHEN a = b THEN c = d ...
+ // Out: ... CASE WHEN a = b THEN IIF(c = d, 1, 0) ...
Review Comment:
IIF is more readable. This is only for the MsSql, other dialects will have
their own implementations.
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