flashzxi commented on a change in pull request #5273:
URL: https://github.com/apache/iotdb/pull/5273#discussion_r830747437
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File path: antlr/src/main/antlr4/org/apache/iotdb/db/qp/sql/SqlLexer.g4
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@@ -827,7 +827,8 @@ MOD : '%';
// Operators. Comparation
-OPERATOR_EQ : '=' | '==';
+OPERATOR_DEQ : '==';
Review comment:
if just use OPERATOR_EQ, parser can't tell the difference between
"compare equal to" and "valuation".
for example:
select ts=1 and udf(ts,"id"="value") from root.test;
parser don't know whether "id"="value" means valuation or means a string
equals to another string
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