How can we change the default rules used by the parser to parse built-in function names?

#The parser's default rules for parsing built-in function names can be changed by enabling IGNORE_SPACE SQL mode. When we enable this mode, the parser relaxes the requirement that there is no space between the function name and the following parenthesis. For example, with IGNORE_SPACE SQL mode enabled, the following two function calls are legal -

Select SUM(Salary) from employee;
Select SUM (Salary) from employee;

However, in this case, the parser treats the function name as a reserved word. This means that spaces after the name no longer represent identifiers.

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