Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/5827#discussion_r29507934
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SQLContext.scala ---
@@ -45,6 +48,45 @@ import org.apache.spark.util.Utils
import org.apache.spark.{Partition, SparkContext}
/**
+ * Currently we support the default dialect named "sql", associated with
the class
+ * [[DefaultDialect]]
+ *
+ * And we can also provide custom SQL Dialect, for example in Spark SQL
CLI:
+ * {{{
+ *-- switch to "hiveql" dialect
+ * spark-sql>SET spark.sql.dialect=hiveql;
+ * spark-sql>SELECT * FROM src LIMIT 1;
+ *
+ *-- switch to "sql" dialect
+ * spark-sql>SET spark.sql.dialect=sql;
+ * spark-sql>SELECT * FROM src LIMIT 1;
+ *
+ *-- register the new SQL dialect
+ * spark-sql> SET spark.sql.dialect=com.xxx.xxx.SQL99Dialect;
+ * spark-sql> SELECT * FROM src LIMIT 1;
+ *
+ *-- register the non-exist SQL dialect
+ * spark-sql> SET spark.sql.dialect=NotExistedClass;
+ * spark-sql> SELECT * FROM src LIMIT 1;
+ *
+ *-- Exception will be thrown and switch to dialect
+ *-- "sql" (for SQLContext) or
+ *-- "hiveql" (for HiveContext)
+ * }}}
+ */
+private[spark] class DefaultDialect extends Dialect {
+ @transient
+ protected val sqlParser = {
+ val catalystSqlParser = new catalyst.SqlParser
+ new SparkSQLParser(catalystSqlParser.parse)
--- End diff --
https://github.com/apache/spark/pull/5827/files#diff-131c27c6a1f59770d738b11f2a4755ecR180
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