viirya commented on a change in pull request #23897:
[SPARK-26215][SQL][FOLLOW-UP][MINOR] Fix the warning from ANTR4
URL: https://github.com/apache/spark/pull/23897#discussion_r260323392
##########
File path:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
##########
@@ -1014,7 +1014,8 @@ SORTED: 'SORTED';
PURGE: 'PURGE';
INPUTFORMAT: 'INPUTFORMAT';
OUTPUTFORMAT: 'OUTPUTFORMAT';
-DATABASE: 'DATABASE' | 'SCHEMA';
+SCHEMA: 'SCHEMA';
+DATABASE: 'DATABASE';
Review comment:
Previously, token `schema` is synonymous with token `database`.
Won't this change drop support of commands like `CREATE SCHEMA ...`, `ALTER
SCHEMA ...`, `DROP SCHEMA ...`?
```
scala> sql("create schema test1")
org.apache.spark.sql.catalyst.parser.ParseException:
no viable alternative at input 'create schema'(line 1, pos 7)
== SQL ==
create schema test1
-------^^^
at
org.apache.spark.sql.catalyst.parser.ParseException.withCommand(ParseDriver.scala:243)
at
org.apache.spark.sql.catalyst.parser.AbstractSqlParser.parse(ParseDriver.scala:119)
at
org.apache.spark.sql.execution.SparkSqlParser.parse(SparkSqlParser.scala:48)
at
org.apache.spark.sql.catalyst.parser.AbstractSqlParser.parsePlan(ParseDriver.scala:69)
at org.apache.spark.sql.SparkSession.$anonfun$sql$1(SparkSession.scala:653)
at
org.apache.spark.sql.catalyst.QueryPlanningTracker.measurePhase(QueryPlanningTracker.scala:111)
at org.apache.spark.sql.SparkSession.sql(SparkSession.scala:653)
... 49 elided
```
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