cloud-fan commented on a change in pull request #35494:
URL: https://github.com/apache/spark/pull/35494#discussion_r814549510
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File path: sql/core/src/main/scala/org/apache/spark/sql/jdbc/JdbcDialects.scala
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@@ -194,6 +195,21 @@ abstract class JdbcDialect extends Serializable with
Logging{
case _ => value
}
+ /**
+ * Converts V2 expression to String representing a SQL expression.
+ * @param expr The V2 expression to be converted.
+ * @return Converted value.
+ */
+ @Since("3.3.0")
+ def compileExpression(expr: Expression): Option[String] = {
+ val V2ExpressionSQLBuilder = new V2ExpressionSQLBuilder()
+ try {
+ Some(V2ExpressionSQLBuilder.build(expr))
Review comment:
Shall we have a JDBC v2 specific `V2ExpressionSQLBuilder`
implementation? One requirement is that JDBC v2 should not support nested
columns, so `visitFieldReference` should only work for single-part name.
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