Merge branch 'support_select_regex' of https://github.com/janewangfb/spark into support_select_regex

Author: janewangfb

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala

@@ -23,10 +23,9 @@ import javax.xml.bind.DatatypeConverter
 
 import scala.collection.JavaConverters._
 import scala.collection.mutable.ArrayBuffer
-
 import org.antlr.v4.runtime.{ParserRuleContext, Token}
 import org.antlr.v4.runtime.tree.{ParseTree, RuleNode, TerminalNode}
-
+import org.apache.spark.SparkEnv
 import org.apache.spark.internal.Logging
 import org.apache.spark.SparkEnv
 import org.apache.spark.sql.AnalysisException