Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/10541#discussion_r48727289
--- Diff:
sql/hive/src/main/antlr3/org/apache/spark/sql/parser/SparkSqlParser.g ---
@@ -637,7 +637,7 @@ import org.apache.hadoop.hive.conf.HiveConf;
// counter to generate unique union aliases
private int aliasCounter;
private String generateUnionAlias() {
- return "_u" + (++aliasCounter);
+ return "u_" + (++aliasCounter);
--- End diff --
This change is because Hive lexer doesn't allow identifiers starting with
underscore.
(All other changes in this file are caused by removing training spaces.)
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