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This patch extends the SHOW PARTITIONS statement to allow an optional WHERE clause that filters partitions based on partition column values. The implementation adds support for various comparison operators, IN lists, BETWEEN clauses, IS NULL, and logical AND/OR expressions involving partition columns. Non-partition columns, subqueries, and analytic expressions in the WHERE clause are not allowed and will result in an analysis error. New analyzer tests have been added to AnalyzeDDLTest#TestShowPartitions to verify correct parsing, semantic validation, and error handling for supported and unsupported cases. Testing: - Added new unit tests in AnalyzeDDLTest for valid and invalid WHERE clause cases. - Verified functional tests covering partition filtering behavior. Change-Id: I2e2a14aabcea3fb17083d4ad6f87b7861113f89e Reviewed-on: http://gerrit.cloudera.org:8080/23566 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>