WIP: Support constraints for ALTER COLUMN TYPE#48516

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RichardJCai wants to merge 3 commits intocockroachdb:masterfrom RichardJCai:alter_column_set_data_type_constraints

+2,303-723

Commits on May 1, 2020

Support experimental ALTER COLUMN TYPE general online schema change.
RichardJCai
committed
Support experimental ALTER COLUMN TYPE general online schema change.
RichardJCai
committed

Commits on May 6, 2020

Support altering data type of a column that has check constraints.
RichardJCai
committed