XieJiann commented on code in PR #15659:
URL: https://github.com/apache/doris/pull/15659#discussion_r1063156879
##########
fe/fe-core/src/main/antlr4/org/apache/doris/nereids/DorisParser.g4:
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@@ -300,6 +300,9 @@ primaryExpression
| identifier LEFT_PAREN ((DISTINCT|ALL)? arguments+=expression
(COMMA arguments+=expression)*)? RIGHT_PAREN
#functionCall
| LEFT_PAREN query RIGHT_PAREN
#subqueryExpression
+ | ATSIGN identifier
#userVariable
+ | DOUBLEATSIGN kind=(GLOBAL | SESSION) DOT identifier
#systemVariable
+ | DOUBLEATSIGN identifier
#systemVariable
Review Comment:
done
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