Query validation before the parser.

[Modassar Ather <mo...@gmail.com>]

Hi,

Queries like wildcards are expensive in terms of execution time and
resources. Also there could be possible errors in user entered queries.

I am trying to write a query validation feature which checks for wrong
grouping, not supported fields, special characters in query without
escaping.
The same feature will also check for the complexity of the query and its
possible impact on resources.

Kindly share your thoughts on what factors should be considered in query
validation for general errors and its complexity and impact on resources.

Thanks,
Modassar