Rework table scans #1141
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Rework table scans #1141
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Introduce
scaninterface for NodeTable and RelTable. Scan operators are now simplified to delegate details of reading from columns/lists to tables.The motivation for this change is that we need a better interface between query processor and storage, so scan operators can be ignorant of how tables are actually stored, and can be portable to various table implementations, such as an external table based on parquet files in the future.