huaxingao commented on code in PR #36556:
URL: https://github.com/apache/spark/pull/36556#discussion_r873942747
##########
sql/core/src/main/scala/org/apache/spark/sql/jdbc/JdbcDialects.scala:
##########
@@ -240,8 +240,27 @@ abstract class JdbcDialect extends Serializable with
Logging{
getJDBCType(dataType).map(_.databaseTypeDefinition).getOrElse(dataType.typeName)
s"CAST($l AS $databaseTypeDefinition)"
}
+
+ override def visitSQLFunction(funcName: String, inputs: Array[String]):
String = {
+ if (isSupportedFunction(funcName)) {
+ s"""$funcName(${inputs.mkString(", ")})"""
+ } else {
+ // The framework will catch the error and give up the push-down.
+ // Please see `JdbcDialect.compileExpression(expr: Expression)` for
more details.
+ throw new UnsupportedOperationException(
+ s"${this.getClass.getSimpleName} does not support function:
$funcName")
+ }
+ }
}
+ /**
+ * Returns whether the database supports function.
+ * @param funcName Upper-cased function name
+ * @return True if the database supports function.
+ */
+ @Since("3.3.0")
Review Comment:
Let's hope this can still make RC2.
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