yaooqinn commented on a change in pull request #29627:
URL: https://github.com/apache/spark/pull/29627#discussion_r482647064
##########
File path:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
##########
@@ -818,6 +818,7 @@ primaryExpression
constant
: NULL
#nullLiteral
+ | INTERVAL STRING AS? identifier?
#maybeAliasedIntervalLiteral
Review comment:
```
postgres=# select interval '1 day' day;
interval
----------
1 day
(1 row)
postgres=# select interval '1' day day;
ERROR: syntax error at or near "day"
LINE 1: select interval '1' day day;
^
postgres=# select interval '1' day;
interval
----------
1 day
(1 row)
```
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