Databricks dialect

[KantorSerhiy]

Hi @EvgSkv!

In the continuation of the discussion #236 -> I add the databricks dialect.

I am waiting for feedback from you!
Thank you.
Serhii.

[EvgSkv]

Thanks for the contribution! Please see a couple requests to comment inline. Overall looks great!

[EvgSkv]

For Apache compliance please add leading comment:

#!/usr/bin/python
#
# Copyright 2023 Logica Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

[EvgSkv]

Can you please add a brief comment explaining current state of the dialect. I.e. what are critical features yet to be implemented?

E.g.:

1. Unnesting. Does this work?

Q(x) :- x in [1,2,3];

2. Records.
   Does this work?

P({a:1, b: ["x","y"]});

I am assuming something is yet TODO, is that so?

[KantorSerhiy]

hey @EvgSkv, i add Apache compliance comment and checked Unnesting and Records.
It works.
I'm not entirely sure about the function UnnestPhrase, but for my cases - it works.

also i added minor TODO, but they are not critical.
I hope it will be useful for you!

Serhii.

[EvgSkv]

Looking great! I'll be resolving conflicts and merging the PR this week. Thank you @KantorSerhiy !