Dandandan commented on code in PR #15532:
URL: https://github.com/apache/datafusion/pull/15532#discussion_r2024211429
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datafusion/sqllogictest/test_files/explain.slt:
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@@ -244,6 +244,159 @@ physical_plan DataSourceExec: file_groups={1 group:
[[WORKSPACE_ROOT/datafusion/
physical_plan_with_stats DataSourceExec: file_groups={1 group:
[[WORKSPACE_ROOT/datafusion/core/tests/data/example.csv]]}, projection=[a, b,
c], file_type=csv, has_header=true, statistics=[Rows=Absent, Bytes=Absent,
[(Col[0]:),(Col[1]:),(Col[2]:)]]
physical_plan_with_schema DataSourceExec: file_groups={1 group:
[[WORKSPACE_ROOT/datafusion/core/tests/data/example.csv]]}, projection=[a, b,
c], file_type=csv, has_header=true, schema=[a:Int32;N, b:Int32;N, c:Int32;N]
+# test SUM function with constant
+# Both the SUM(a + literal) and SUM(literal + a) should be optimized to SUM(a)
+ count(*) * literal
+query TT
+EXPLAIN VERBOSE SELECT SUM(a + 1), SUM(a + 2), SUM(3 + a) FROM
simple_explain_test
Review Comment:
I added some thoughts of generalizing this optimization here (which should
benefit more common uses)
https://github.com/apache/datafusion/issues/15524#issuecomment-2771525677
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