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Calcite sets literal expressions to EXPR$<x> which did not match expressions given by the Impala planner. For literal expressions such as "select 1 + 1", Impala creates the column name as "1 + 1". The field names can be found in the abstract syntax tree, so they are not set within the CalciteRelNodeConverter before the logical tree is created. A small test was added to calcite.test for a basic sanity check, but more comprehensive tests will be run in the tests/shell module (e.g. in test_shell_commandline.py and test_shell_interactive) which contain tests for labels. Change-Id: Ibd3e6366a284f53807b4b2c42efafa279249c1ea Reviewed-on: http://gerrit.cloudera.org:8080/23516 Reviewed-by: Steve Carlin <scarlin@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>