findepi commented on code in PR #17088:
URL: https://github.com/apache/datafusion/pull/17088#discussion_r2265225610
##########
datafusion/sqllogictest/test_files/predicates.slt:
##########
@@ -777,6 +777,52 @@ physical_plan
16)--------------------RepartitionExec: partitioning=RoundRobinBatch(4),
input_partitions=1
17)----------------------DataSourceExec: file_groups={1 group:
[[WORKSPACE_ROOT/datafusion/core/tests/tpch-csv/part.csv]]},
projection=[p_partkey, p_brand], file_type=csv, has_header=true
+# Simplification of a binary operator with a NULL value
+
+statement ok
+create table t(x int) as values (1), (2), (3);
+
+query TT
+EXPLAIN FORMAT INDENT SELECT x > NULL FROM t;
+----
+logical_plan
+01)Projection: Boolean(NULL) AS t.x > NULL
+02)--TableScan: t projection=[]
+physical_plan
+01)ProjectionExec: expr=[NULL as t.x > NULL]
+02)--DataSourceExec: partitions=1, partition_sizes=[1]
+
+query TT
+EXPLAIN FORMAT INDENT SELECT * FROM t WHERE x > NULL;
+----
+logical_plan EmptyRelation
+physical_plan EmptyExec
+
+query TT
+EXPLAIN FORMAT INDENT SELECT * FROM t WHERE x < 5 AND (10 * NULL < x);
+----
+logical_plan
+01)Filter: t.x < Int32(5) AND Boolean(NULL)
+02)--TableScan: t projection=[x]
+physical_plan
+01)CoalesceBatchesExec: target_batch_size=8192
+02)--FilterExec: x@0 < 5 AND NULL
Review Comment:
I fell into this trap myself too in initial version of this PR.
however `false AND NULL` is `false`.
for a FilterExec it doesn't matter (unless negated), but for a projection it
always does
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