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* [LIQ] Extend with `group by` and `having` support Also update documentation with extensive examples and add some parser tests. Note: `make generate` JS files included. Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz> * Merge `liq-add-support-for-aggregators` branch Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz> * Fix link, remove `_` example Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz> * Wrap example LIQ queries inside `query [[ .. ]]` and replace `sql` code block type to `lua` Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz> * Example self-consistency fix Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz> * Fixed some queries * Add experimental tags to LIQ aggregation/grouping --------- Signed-off-by: Matouš Jan Fialka <mjf@mjf.cz> Co-authored-by: Zef Hemel <zef@zef.me>