Change in identifier case during reformatting

[JohnMount]

First, thanks for a great and useful package.

I am seeing an identifier change case during transform. Possibly this is my fault as I don't know how to tell sqlparse what the identifier and string quotes are. The back-tick identifier quotes are for use with Google BigQuery.

My example is as follows. Notice how data-algebra-test.test_1.d changed to DATA-algebra-test.test_1.d.

import sqlparse

sqlparse.__version__
# '0.4.1'

sql = "SELECT (`x` = -`x`) AS `x_is_bad` FROM `data-algebra-test.test_1.d`"

sqlparse_options = {"reindent": True, "keyword_case": "upper"}
formatted_sql = sqlparse.format(
    sql, **sqlparse_options
)

print(formatted_sql)
# SELECT (`x` = -`x`) AS `x_is_bad` FROM `DATA-algebra-test.test_1.d`
assert 'DATA' not in formatted_sql

[MatthieuColinBM]

Hello there, I have exactly the same behavior. DATA is reconized as a keyword and is put in uppercase, but this iw messing with the project/dabatase name in Big Query. What is DATA used for as a keyword ? It seems not to be used in all SQL languages ?

The best scenario would be to be able to send a list of keywords to buypass.

My SQL :

CREATE OR REPLACE VIEW data-project.data-universes-eu.fact_exchange_rates => is traformed as : CREATE OR REPLACE VIEW DATA-project.data-universes-eu.fact_exchange_rates wich is not undestrood by Big Query as the project id should be lowercase