strongduanmu commented on code in PR #27091:
URL: https://github.com/apache/shardingsphere/pull/27091#discussion_r1263273664


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parser/sql/dialect/oracle/src/main/antlr4/imports/oracle/BaseRule.g4:
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@@ -613,6 +612,7 @@ notOperator
 
 booleanPrimary
     : booleanPrimary IS NOT? (TRUE | FALSE | UNKNOWN | NULL)
+    | PRIOR predicate

Review Comment:
   > `booleanPrimary` refers to the grammar structure of mysql, the 
`booleanPrimary` concept goes beyond itself, so it can only be added here.
   
   Thank you, I got it.



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