fix: add unique constraint

[guilhas07]

This is an attempt to solve #249 .

I updated a test to include the UNIQUE keyword. However, I'm having trouble running the tests (even before making these changes) to verify if everything is correct:

$ make test
test
make: *** [Makefile:26: test] Error 1

EDIT: found how to run the tests. There is one that is failing (but already was failing before I believe).
Maybe the tree-sitter-cli requirement should be mentioned in CONTRIBUTING.md?

Please let me know if there is something else that I should do/change!

[matthias-Q]

LGTM, just adopt the tests that we cover both variants

[matthias-Q]

can you keep the old line and add a new line like

  date DATE DEFAULT NULL ASC,
  date2 DATE DEFAULT NULL UNIQUE ASC

[matthias-Q]

tree-sitter changed some thing with regards on query matching order in one of the last releases. Thats why tests are failing for you. We are aware of that and planning to update tree-sitter. The requirement for tree-sitter-cli is pinned in package.json

[guilhas07]

can you keep the old line and add a new line like

Done!

The requirement for tree-sitter-cli is pinned in package.json

Ohh ok, so there is actually no need to run make test and instead we should run npm test?

Strange that both differ:

• make test:

    ✓ union.sql (13 assertions)
    ✗ query.sql
      Failure - row: 0, column: 7, expected highlight 'function.call', actual highlights: 'type'
make: *** [Makefile:26: test] Error 1

• npm test:

  ✓ union.sql (13 assertions)
  ✓ query.sql (14 assertions)

[matthias-Q]

You can still use make test but you need tree-sitter-cli 0.20.*

The "fix" for this issue is to change the order of tree-sitter queries highlights.scm. But that is not related to your MR.