add column-based data structure and related unit test

TuGraph-family / tugraph-db

TuGraph: A High Performance Graph Database.

https://tugraph.org

Apache License 2.0

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Closed Myrrolinz closed 1 month ago

Myrrolinz commented 3 months ago

bitmask
cypher_string_t: new basic data structure for string type. For string type <= 4 bytes, store it in prefix[], otherwise store the rest of it in a buffer.
column_vector: column-based structure. ColumnVector for int, StringColumn for string.
test_column_vector: test file.

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