The `index_exists?` method wasn't very specific so when we added the
`if_not_exists` to `add_index` and `if_exists` to `remove_index` there
were a few cases where behavior was unexpected.
For `add_index` if you added a named index and then added a second index
with the same columns, but a different name, that index would not get
added because `index_exists` was looking only at column named and not at
the exact index name. We fixed `add_index` by moving the `index_exists`
check below `add_index_options` and pass `name` directly to
`index_exists` if there is a `if_not_exists` option.
For `remove_index` if you added a named index and then tried to remove
it with a nil column and a explicit name the index would not get removed
because `index_exists` saw a nil column. We fixed this by only doing the
column check in `index_exists` if `column` is present.
Co-authored-by: John Crepezzi <john.crepezzi@gmail.com>
5b5da30bc0