Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/20194#discussion_r161000312
--- Diff:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
@@ -141,7 +141,7 @@ statement
(LIKE? pattern=STRING)?
#showTables
| SHOW TABLE EXTENDED ((FROM | IN) db=identifier)?
LIKE pattern=STRING partitionSpec?
#showTable
- | SHOW DATABASES (LIKE pattern=STRING)?
#showDatabases
+ | SHOW DATABASES (LIKE? pattern=STRING)?
#showDatabases
--- End diff --
Impala is the only reference I can find
https://www.cloudera.com/documentation/enterprise/5-10-x/topics/impala_show.html
To be consistent with the other SHOW function, we can make LIKE optional?
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