Exclude "distinct from" from hard coded references flag

[graciegoheen]

This is a:

• bug fix PR with no breaking changes
• new functionality

Link to Issue

Closes #338

Description & motivation

SQL that uses is distinct from or is not distinct from is being incorrectly flagged as a hard coded reference.

Example:

    select
        old.* exclude (fact_effective_thru, fact_history_is_current) 
        ,current_timestamp() as fact_effective_thru
        ,false as fact_history_is_current
    from
        {{ref(old_state)}} as old
    inner join {{ref(new_state)}} as new
        using(fact_durable_key)
    where
        old.ALL_SOURCE_ATTRIBUTES is distinct from new.ALL_SOURCE_ATTRIBUTES

new.ALL_SOURCE_ATTRIBUTES is being flagged.

I added a negative lookback for distinct to all regex checks.

Integration Test Screenshot

Checklist

• I have verified that these changes work locally on the following warehouses (Note: it's okay if you do not have access to all warehouses, this helps us understand what has been covered)
  • BigQuery
  • Postgres
  • Redshift
  • Snowflake
  • Databricks
  • DuckDB
  • Trino/Starburst
• I have updated the README.md (if applicable)
• I have added tests & descriptions to my models (and macros if applicable)

[b-per]

Yeahh, regexes to review!

[dave-connors-3]

@graciegoheen did you make changes to the seeds at all to catch this new model?

[graciegoheen]

@dave-connors-3 No just added this to int_model_5:

select 1 as id
-- from {{ ref('int_model_4') }}
-- inner join {{ ref('stg_model_1') }}
-- on int_model_4.join_field = stg_model_1.join_field
-- where int_model_4.id is distinct from stg_model_1.id

[dave-connors-3]

@graciegoheen ah i see i guess we would indeed not expect a new violation there lol

[dave-connors-3]

was this edit needed?

[graciegoheen]

no lol

[dave-connors-3]

ugh come on