Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/8676#discussion_r39230841
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/jdbc/JdbcDialects.scala ---
@@ -88,6 +88,17 @@ abstract class JdbcDialect {
def quoteIdentifier(colName: String): String = {
s""""$colName""""
}
+
+ /**
+ * Get the SQL query that should be used to find if the given table
exists. Dialects can
+ * override this method to return a query that works best in a
particular database.
+ * @param table The name of the table.
+ * @return The SQL query to use for checking the table.
+ */
+ def getTableExistsQuery(table: String): String = {
+ s"SELECT * FROM $table WHERE 1=0"
--- End diff --
actually never mind we cannot quote it.
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