Add support of DROP|CLEAR|MATERIALIZE PROJECTION syntax for ClickHouse
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ClickHouse allows to maintain its projection via using alter table with `ADD|DROP|CLEAR|MATERIALIZE PROJECTION`. For the documentation, please refer to: [1] https://clickhouse.com/docs/en/sql-reference/statements/alter/projection#drop-projection [2] https://clickhouse.com/docs/en/sql-reference/statements/alter/projection#clear-projection [3] https://clickhouse.com/docs/en/sql-reference/statements/alter/projection#materialize-projection This PR also introduces two keywords: - CLEAR - MATERIALIZE
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ClickHouse allows to maintain its projection via using alter table with
ADD|DROP|CLEAR|MATERIALIZE PROJECTION. For the documentation, please refer to:[1] https://clickhouse.com/docs/en/sql-reference/statements/alter/projection#drop-projection
[2] https://clickhouse.com/docs/en/sql-reference/statements/alter/projection#clear-projection
[3] https://clickhouse.com/docs/en/sql-reference/statements/alter/projection#materialize-projection
This PR also introduces two keywords: