[SPARK-13689][SQL] Move helper things in CatalystQl to new utils object

## What changes were proposed in this pull request?

When we add more DDL parsing logic in the future, SparkQl will become very big. To keep it smaller, we'll introduce helper "parser objects", e.g. one to parse alter table commands. However, these parser objects will need to access some helper methods that exist in CatalystQl. The proposal is to move those methods to an isolated ParserUtils object.

This is based on viirya's changes in #11048. It prefaces the bigger fix for SPARK-13139 to make the diff of that patch smaller.

## How was this patch tested?

No change in functionality, so just Jenkins.

Author: Andrew Or <andrew@databricks.com>

Closes #11529 from andrewor14/parser-utils.

1 files changed, 3 insertions, 1 deletions

diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkQl.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkQl.scala
index 9143258abb..471a5e436c 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkQl.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkQl.scala
@@ -19,13 +19,15 @@ package org.apache.spark.sql.execution
 import org.apache.spark.sql.{AnalysisException, SaveMode}
 import org.apache.spark.sql.catalyst.TableIdentifier
 import org.apache.spark.sql.catalyst.analysis.UnresolvedRelation
-import org.apache.spark.sql.catalyst.parser.{ASTNode, CatalystQl, ParserConf, SimpleParserConf}
+import org.apache.spark.sql.catalyst.parser._
 import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan, OneRowRelation}
 import org.apache.spark.sql.execution.command._
 import org.apache.spark.sql.execution.datasources._
 import org.apache.spark.sql.types.StructType
 
 private[sql] class SparkQl(conf: ParserConf = SimpleParserConf()) extends CatalystQl(conf) {
+  import ParserUtils._
+
   /** Check if a command should not be explained. */
   protected def isNoExplainCommand(command: String): Boolean = "TOK_DESCTABLE" == command