snuyanzin commented on code in PR #28290:
URL: https://github.com/apache/flink/pull/28290#discussion_r3448172556
##########
flink-table/flink-sql-parser/src/main/java/org/apache/flink/sql/parser/validate/FlinkSqlConformance.java:
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@@ -117,6 +122,11 @@ public boolean allowNiladicParentheses() {
return true;
}
+ @Override
+ public boolean allowNiladicConstantWithoutParentheses() {
+ return true;
+ }
Review Comment:
as mentioned in Calcite's javadoc
```
* Whether to allow parentheses to be specified in calls to niladic
functions of
* returned the specific constant value.
*
* <p>For example, {@code PI} is a niladic function and return specific
constant values pi.
* In standard SQL it must be invoked with parentheses:
*
* <blockquote><code>VALUES PI()</code></blockquote>
*
* <p>If {@code allowNiladicConstantWithoutParentheses}, the following
syntax is also valid:
```
https://github.com/apache/calcite/blob/1219091d2b76ccb1dfaa6f1f02c89c2a9ed5e532/core/src/main/java/org/apache/calcite/sql/validate/SqlConformance.java#L410-L432
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