Support for postgres DROP CONSTRAINT ... CASCADE

[Matt Stubbs]

Support for the CASCADE option was added to DROP command previously. However, attempting to use it to drop a constraint is prevented with the error:

  ** (ArgumentError) PostgreSQL does not support CASCADE in DROP CONSTRAINT commands

According to the PostgresQL docs CASCADE is supported (by all current versions from what I can see).

  DROP CONSTRAINT [ IF EXISTS ] constraint_name [ RESTRICT | CASCADE ]

Is there a reason DROP CONSTRAINT ... CASCADE is not supported? If not, would support be welcome?

(BTW - first time posting. Feedback appreciated.)

-matt

[José Valim]

PRs welcome!

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