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sql: properly enforce uniqueness of key columns for FK references #43793

Merged
merged 1 commit into from
Jan 14, 2020
Merged

sql: properly enforce uniqueness of key columns for FK references #43793

merged 1 commit into from
Jan 14, 2020

Commits on Jan 14, 2020

  1. sql: properly enforce uniqueness of key columns for FK references 

    We introduced a bug in 19.2 that would allow, e.g., a unique index on `(a, b,
c)` to be used as an index that is supposed to enforce uniqueness for a foreign
key constraint pointing only to `(a, b)`. This PR reintroduces a check that the
indexed columns match the FK columns exactly.

Release note (bug fix): Fixed a bug introduced in 19.2 that would allow foreign
keys to use a unique index on the referenced columns that indexed more columns
than were included in the columns used in the FK constraint, which allows
potentially violating uniqueness in the referenced columns themselves.
    @lucy-zhang
    lucy-zhang committed Jan 14, 2020
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