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1b151eda4b
Begins adding support for running "tagged queries" to the compute engine. Here, it's just the `LuceneSourceOperator` because that's useful and contained. Example time! Say you are running: ``` FROM foo | STATS MAX(v) BY ROUND_TO(g, 0, 100, 1000, 100000) ``` It's *often* faster to run this as four queries: * The docs that round to `0` * The docs that round to `100` * The docs that round to `1000` * The docs that round to `100000` This creates an ESQL operator that can run these queries, one after the other and attach those tags. Aggs uses this trick and it's *way* faster when it can push down count queries, but it's still faster when it pushes doc loading things. This implementation in `LuceneSourceOperator` is quite similar to the doc loading version in _search. I don't have performance measurements yet because I haven't plugged this into the language. In _search we call this `filter-by-filter` and enable it when each group averages to more than 5000 documents and when there isn't an `_doc_count` field. It's faster in those cases not to push. I expect we'll be pretty similar. |
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