When inserting

1 Building a dictionary by putting values into an in-memory array and encoding it with sequence order.

2 Store row values with encoding number(in-memory)

3 keep an index of distinct values with red-black-tree.



2 When flushing column


1 Re-encoding data

2 Building a mapping between two encoding(in-memory)

3 when flush rows into disk, use new encoding number

4 column layout

3 When reading




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