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https://issues.apache.org/jira/browse/CALCITE-6436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17862762#comment-17862762
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xiong duan commented on CALCITE-6436:
-------------------------------------
Fixed in
[d2e3350|https://github.com/apache/calcite/commit/d2e335021184b7a30af459c1f2d587286d017e61].
Thanks for the review [~mbudiu] and [~caicancai].
> JDBC adapter generates SQL missing parentheses when comparing 3 values with
> the same precedence like (a=b)=c
> ------------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-6436
> URL: https://issues.apache.org/jira/browse/CALCITE-6436
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.37.0
> Reporter: Ulrich Kramer
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
>
> Running the following unit test in {{JdbcAdapterTest}} fails with
> {code:java}
> @Test void testOperatorInWhere() {
> CalciteAssert.model(FoodmartSchema.FOODMART_MODEL)
> .query("select * from \"sales_fact_1997\" "
> + "where (\"product_id\" = 1) = ?")
> .consumesPreparedStatement(p -> p.setBoolean(1, true))
> .runs();
> }
> {code}
> {noformat}
> Caused by: java.sql.SQLSyntaxErrorException: unexpected token: = : line: 3 in
> statement [SELECT *
> FROM "foodmart"."sales_fact_1997"
> WHERE "product_id" = 1 = ?
> {noformat}
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