sunxiaoguang commented on code in PR #49452:
URL: https://github.com/apache/spark/pull/49452#discussion_r1913065220
##########
sql/core/src/main/scala/org/apache/spark/sql/jdbc/OracleDialect.scala:
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@@ -61,6 +61,34 @@ private case class OracleDialect() extends JdbcDialect with
SQLConfHelper with N
} else {
super.visitAggregateFunction(funcName, isDistinct, inputs)
}
+
+ private def compareBlob(lhs: Expression, operator: String, rhs:
Expression): String = {
+ val l = inputToSQL(lhs)
+ val r = inputToSQL(rhs)
+ val op = if (operator == "<=>") "=" else operator
+ val compare = s"DBMS_LOB.COMPARE($l, $r) $op 0"
+ if (operator == "<=>") {
+ s"(($l IS NOT NULL AND $r IS NOT NULL AND $compare) OR ($l IS NULL AND
$r IS NULL))"
+ } else {
+ compare
+ }
+ }
+
+ override def build(expr: Expression): String = expr match {
Review Comment:
We can only rewrite comparison when one of the arguments is BLOB. For other
cases, we have to use existing implementation.
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