[fix](schema change) fix delete predicate incorrect comparisons result with empty strings during schema change #41064
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…t with empty strings during schema change
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no need to add an empty file, just use result = sql """ to check result.
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use result = sql """ to get rid of empty .out file.
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…t with empty strings during schema change (#41064) ### problem ``` insert into t1 (k1, k2, v1) value(1, '', 2); delete form t1 where k1 = 1 and k2 = ''; alter table modify column v1 string select * from t1 // expect 0 rows in return, but get 1 row. ```
…t with empty strings during schema change (apache#41064) ``` insert into t1 (k1, k2, v1) value(1, '', 2); delete form t1 where k1 = 1 and k2 = ''; alter table modify column v1 string select * from t1 // expect 0 rows in return, but get 1 row. ```
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