QL: "fields" api implementation in QL #68802
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…o ql_fields_api_implementation
…o ql_fields_api_implementation
…-flattened structure (#68745)
…stic/elasticsearch into ql_fields_api_implementation
astefan
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>enhancement
>breaking
:Analytics/SQL
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Pinging @elastic/es-ql (Team:QL) |
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Pinging @elastic/es-ql (Team:QL) |
astefan
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Feb 10, 2021
* Integrate "fields" API into QL (elastic#68467) * QL: retry SQL and EQL requests in a mixed-node (rolling upgrade) cluster (elastic#68602) * Adapt nested fields extraction from "fields" API output to the new un-flattened structure (elastic#68745) (cherry picked from commit ee5cc54)
This was referenced Feb 17, 2021
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This was referenced Feb 22, 2021
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This code change achieves witching from using
docvalue_fieldsand_sourceextraction to using thefieldsAPI. It helps simplify the QL code, but does also come with a small drawback which will become visible inFieldHitExtractorTestswhere some tests are not needed anymore. Any query (especially SQL) on fields that have_sourcedisabled, but are indexed (accessible throughdocvalue_fields), will not be possible anymore.This PR, also, improves bwc checks when it comes to running queries in a mixed-versions cluster (a rolling upgrade scenario) by using a minimum compatibility version when creating a search request against ES and re-trying the request if the search proves to be executed on at least one incompatible shard. The retrial happens on a node that has an older version, the original request (SQL/EQL request) being sent through transport layer. The node receiving the retried request will re-parse it and create another query DSL to be sent to ES.
Addresses #67727.
PRs in this merge:
#68467
#68602
#68745