Github user klinvill commented on a diff in the pull request:
https://github.com/apache/spark/pull/16746#discussion_r98814211
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/jdbc/TeradataDialect.scala ---
@@ -0,0 +1,33 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.sql.jdbc
+
+import java.sql.Types
+import org.apache.spark.sql.types._
+
+
+private case object TeradataDialect extends JdbcDialect {
+
+ override def canHandle(url: String): Boolean = {
url.startsWith("jdbc:teradata") }
+
+ override def getJDBCType(dt: DataType): Option[JdbcType] = dt match {
+ case StringType => Some(JdbcType("VARCHAR(255)",
java.sql.Types.VARCHAR))
+ case BooleanType => Option(JdbcType("CHAR(1)", java.sql.Types.CHAR))
+ case _ => None
+ }
--- End diff --
quoteIdentifier and getTableExistsQuery will both work for Teradata.
Teradata does not cascade by default but it also doesn't have a TRUNCATE TABLE
command (DELETE is used instead) so any commands that use TRUNCATE TABLE will
fail.
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