[fix](multi-catalog) Disable string dictionary filtering when predicate express is not slot #42113 #42223
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…te express is not slot (apache#42113) ## Proposed changes follow up apache#35335 When the `"case when ... then ... when ... then ... else"` occurs, function_expr may not exist in the pushed down predicate, but the handling of null values is still problematic. table data: ```text mysql> select o_orderpriority from test_string_dict_filter_orc; +-----------------+ | o_orderpriority | +-----------------+ | 5-LOW | | 1-URGENT | | 5-LOW | | NULL | | 5-LOW | +-----------------+ ``` before: ```text mysql> select count(o_orderpriority) from ( select (case when o_orderpriority = 'x' then '1' when o_orderpriority = 'y' then '2' else '0' end) as o_orderpriority from test_string_dict_filter_orc ) as A where o_orderpriority = '0'; +------------------------+ | count(o_orderpriority) | +------------------------+ | 4 | +------------------------+ ``` after: ```text mysql> select count(o_orderpriority) from ( select (case when o_orderpriority = 'x' then '1' when o_orderpriority = 'y' then '2' else '0' end) as o_orderpriority from test_string_dict_filter_orc ) as A where o_orderpriority = '0'; +------------------------+ | count(o_orderpriority) | +------------------------+ | 5 | +------------------------+ ```
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cherry pick from #42113