[core] Make FormatReaderFactory return FileRecordReader to reduce cast #4512
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Purpose
In
ApplyBitmapIndexRecordReaderandApplyBitmapIndexRecordReader, they will check the type of iterator which should beFileRecordIterator, it is alwaysFileRecordIterator, and we should garrantee it by interface.So we let FormatReaderFactory return FileRecordReader, and all related readers should be
FileRecordReaders.Tests
API and Format
Documentation