Highlight in error is off by one for BigQuery when identifiers are quoted

[maureen-daum]

When trying to parse a BigQuery statement that has an error, the returned error info's start_context and highlight are off by one when the query quotes the identifiers.

Fully reproducible code snippet

import sqlglot

sql = "SELECT * FROM `TableA` UNION `TableB`"
try:
    parse = sqlglot.parse_one(sql, read="bigquery")
except Exception as e:
    error = e.errors[0]
    print(f'With quotes: Start context: {error["start_context"]}; Highlight: {error["highlight"]}')


sql = "SELECT * FROM TableA UNION TableB"
try:
    parse = sqlglot.parse_one(sql, read="bigquery")
except Exception as e:
    error = e.errors[0]
    print(f'Without quotes: Start context: {error["start_context"]}; Highlight: {error["highlight"]}')

Expected output:

With quotes: Start context: SELECT * FROM TableA UNION ; Highlight: TableB
Without quotes: Start context: SELECT * FROM TableA UNION ; Highlight: TableB

Actual output:

With quotes: Start context: SELECT * FROM `TableA` UNION `T; Highlight: ableB`
Without quotes: Start context: SELECT * FROM TableA UNION ; Highlight: TableB

[georgesittas]

I'm looking into this, see also #1673 (comment).

EDIT: seems like this is an unrelated issue, although (coincidentally!) also an off by one error! Thanks for the report.

[maureen-daum]

Thanks!