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Regression: projection pushdown doesn't work as expected in DF50 #17513

@xudong963

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@xudong963
// t1 contains a,b
DF49
> explain select from t1 where t1.a > 1;
+--------------+----------------------------------+
| plan_type    | plan                             |
+--------------+----------------------------------+
| logical_plan | Projection:                      |
|              |   Filter: t1.a > Int32(1)        |
|              |     TableScan: t1 projection=[a] |
+--------------+----------------------------------+
1 row(s) fetched.
Elapsed 0.004 seconds.

DF50
> explain select from t1 where t1.a > 1;
+--------------+-----------------------------------+
| plan_type    | plan                              |
+--------------+-----------------------------------+
| logical_plan | Filter: t1.a > Int32(1)           |
|              |   TableScan: t1 projection=[a, b] |
+--------------+-----------------------------------+
1 row(s) fetched.
Elapsed 0.003 seconds.

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