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"""Shared sqlparse configuration for the shell and data-loading scripts."""

import sqlparse

# Impala queries can exceed sqlparse's default grouping limits. This is only used in a
# client context, so DoS is not a concern here.
sqlparse.engine.grouping.MAX_GROUPING_DEPTH = None
sqlparse.engine.grouping.MAX_GROUPING_TOKENS = None

# Work around https://github.com/andialbrecht/sqlparse/issues/814. A backslash must
# consume the next character, so an escaped backslash cannot swallow a closing quote.
SQLPARSE_STRING_REGEX = {
    sqlparse.tokens.String.Single: r"'(?:''|\\[\s\S]|[^'\\])*'",
    sqlparse.tokens.String.Symbol: r'"(?:""|\\[\s\S]|[^"\\])*"',
}
sqlparse.lexer.Lexer.get_default_instance().set_SQL_REGEX([
    (SQLPARSE_STRING_REGEX.get(token_type, regex), token_type)
    for regex, token_type in sqlparse.keywords.SQL_REGEX
])