englefly commented on code in PR #64535:
URL: https://github.com/apache/doris/pull/64535#discussion_r3433173578
##########
fe/fe-core/src/test/java/org/apache/doris/nereids/rules/rewrite/PruneNestedColumnTest.java:
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@@ -207,6 +241,66 @@ public void
testCardinalityMapElementKeepsValueOffsetPath() throws Exception {
ImmutableList.of());
}
+ @Test
+ public void testDeeperNullCoversValueOffsetForMapArray() throws Exception {
+ // cardinality(map_arr_col['a']) -> normalized to KEYS + VALUES.OFFSET
+ // element_at(map_arr_col['a'], 1) IS NULL -> *.*.NULL
+ // *.*.NULL goes deeper into the value-side array, so VALUES.OFFSET
+ // at the map value level is redundant. Without type-aware comparison
+ // * is not lexically equal to VALUES, so VALUES.OFFSET would survive
+ // and cause BE to skip the item iterator.
+ assertAllAccessPathsContain(
+ "select cardinality(map_arr_col['a']), "
+ + "element_at(map_arr_col['a'], 1) is null from
map_array_tbl",
+ ImmutableList.of(path("map_arr_col", "*", "*", "NULL")),
+ ImmutableList.of(path("map_arr_col", "VALUES", "OFFSET")));
+ }
+
+ @Test
+ public void testDataPathCoversNullPathWithMapAwareComparison() throws
Exception {
+ // element_at(map_col, 'a') -> [map_col, *]
+ // map_values(map_col) IS NULL -> [map_col, VALUES, NULL]
+ // [map_col, *] should cover [map_col, VALUES, NULL] because
+ // * ≡ VALUES at the map level (type-aware comparison).
+ // Without the fix, the lexical prefix check fails and the
+ // BE receives VALUES.NULL alongside *, causing the value
+ // iterator to enter NULL_MAP_ONLY and skip real data.
+ assertAllAccessPathsContain(
Review Comment:
"[m, VALUES] 削 [m, *, NULL]" commit
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