[core] Skip pushing down partition filter to file reader

[Zouxxyy]

Purpose

Skip pushing down partition filter to file reader, for the reasons:

• The partition filters have been applied to the splits generation, so pushing them to file has little effect.
• In some scenarios, the data file may not contain partition fields (such as migrate table, or our internal implementation that does not write partition fields). Then, if we push down the partition filter to the parquet reader, we will obtain no data. (The reason behind this is that parquet reader will treat all non-existent fields ​​as null, and if we push down is not null, reader will reject everything).

e.g. SELECT * FROM migrate_tbl WHERE pt = 1 always return nothing

Tests

API and Format

Documentation

[Zouxxyy]

Worried about performance regression, maybe we can add a configuration to control this behavior

[JingsongLi]

Worried about performance regression, maybe we can add a configuration to control this behavior

no need, there is no performance regression