Github user dilipbiswal commented on a diff in the pull request:
https://github.com/apache/spark/pull/11991#discussion_r57646589
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkQl.scala ---
@@ -369,13 +369,33 @@ private[sql] class SparkQl(conf: ParserConf =
SimpleParserConf()) extends Cataly
case Token("TOK_CLEARCACHE", Nil) =>
ClearCacheCommand
+ // SHOW TABLES [(IN|FROM) database_name]
['identifier_with_wildcards']
case Token("TOK_SHOWTABLES", args) =>
- val databaseName = args match {
- case Nil => None
- case Token("TOK_FROM", Token(dbName, Nil) :: Nil) :: Nil =>
Option(dbName)
+ // Parses the following conditions
+ // 1. SHOW TABLES
+ // 2. SHOW TABLES FROM database 'table_pattern'
+ // 3. SHOW TABLES FROM database
--- End diff --
@andrewor14 Hello, we always transform to TOK_FROM for both TOK_IN and
TOK_FROM in the grammer file.
https://github.com/apache/spark/blob/637a78f1d3dff00658324de3887d75c5ccd857be/sql/catalyst/src/main/antlr3/org/apache/spark/sql/catalyst/parser/SparkSqlParser.g#L1473
So now, both form works.
```SQL
show tables from default
show tables in default
```
I will fix up the comments to use 'IN' as opposed to 'FROM'. Did you want
to disallow this syntax in the grammer file ? Would there be a
backward-compatibility issue if we do that ?
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