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This adds support for partial results to SQL. The lenient mode is controlled by a new query paramter, `allow_partial_search_results`, false by default. On shard failures, the errors are added as Warning headers to the response. Only a first set of failures are sent to the client, the last header briefs on the number of remaining suppressed ones.
193 lines
6.3 KiB
Text
193 lines
6.3 KiB
Text
[role="xpack"]
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[[sql-search-api]]
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=== SQL search API
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++++
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<titleabbrev>SQL search</titleabbrev>
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++++
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Returns results for an <<sql-rest-overview,SQL search>>.
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[source,console]
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----
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POST _sql?format=txt
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{
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"query": "SELECT * FROM library ORDER BY page_count DESC LIMIT 5"
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}
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----
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// TEST[setup:library]
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[[sql-search-api-request]]
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==== {api-request-title}
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`GET _sql`
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`POST _sql`
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[[sql-search-api-prereqs]]
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==== {api-prereq-title}
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* If the {es} {security-features} are enabled, you must have the `read`
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<<privileges-list-indices,index privilege>> for the data stream, index,
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or alias you search.
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[[sql-search-api-limitations]]
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===== Limitations
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See <<sql-limitations>>.
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[[search-api-query-params]]
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==== {api-query-parms-title}
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`delimiter`::
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(Optional, string) Separator for CSV results. Defaults to `,`. The API only
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supports this parameter for CSV responses.
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`format`::
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(Optional, string) Format for the response. For valid values, see
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<<sql-rest-format>>.
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+
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You can also specify a format using the `Accept` HTTP header. If you specify
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both this parameter and the `Accept` HTTP header, this parameter takes
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precedence.
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[role="child_attributes"]
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[[sql-search-api-request-body]]
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==== {api-request-body-title}
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`allow_partial_search_results`::
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(Optional, Boolean) If `true`, returns partial results if there are shard
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request timeouts or <<shard-failures,shard failures>>. If `false`, returns an error with no
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partial results. Defaults to `false`.
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`catalog`::
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(Optional, string) Default catalog (cluster) for queries. If unspecified, the
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queries execute on the data in the local cluster only.
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+
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experimental:[] See <<modules-cross-cluster-search,{ccs}>>.
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`columnar`::
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(Optional, Boolean) If `true`, returns results in a columnar format. Defaults to
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`false`. The API only supports this parameter for CBOR, JSON, SMILE, and YAML
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responses. See <<sql-rest-columnar>>.
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`cursor`::
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(Optional, string) <<sql-pagination,Cursor>> used to retrieve a set of paginated
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results. If you specify a `cursor`, the API only uses the `columnar` and
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`time_zone` request body parameters. It ignores other request body parameters.
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[[sql-search-api-fetch-size]]
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`fetch_size`::
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(Optional, integer) Maximum number of rows to return in the response. Defaults
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to `1000`.
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[[sql-search-api-field-multi-value-leniency]]
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`field_multi_value_leniency`::
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(Optional, Boolean) If `false`, the API returns an error for fields containing
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<<array,array values>>. If `true`, the API returns the first value from the
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array with no guarantee of consistent results. Defaults to `false`.
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`filter`::
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(Optional, object) <<query-dsl,Query DSL>> used to filter documents for the SQL
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search. See <<sql-rest-filtering>>.
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`index_include_frozen`::
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(Optional, Boolean) If `true`, the search can run on frozen indices. Defaults to
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`false`.
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`keep_alive`::
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(Optional, <<time-units,time value>>) Retention period for an
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<<sql-async,async>> or <<sql-store-searches,saved synchronous search>>. Defaults
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to `5d` (five days).
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`keep_on_completion`::
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(Optional, Boolean) If `true`, {es} <<sql-store-searches,stores synchronous
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searches>> if you also specify the `wait_for_completion_timeout` parameter. If
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`false`, {es} only stores <<sql-async,async searches>> that don't finish before
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the `wait_for_completion_timeout`. Defaults to `false`.
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`page_timeout`::
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(Optional, <<time-units,time value>>) Minimum retention period for the scroll
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cursor. After this time period, a <<sql-pagination,pagination request>> might
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fail because the scroll cursor is no longer available. Subsequent scroll requests
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prolong the lifetime of the scroll cursor by the duration of `page_timeout` in
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the scroll request. Defaults to `45s` (45 seconds).
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`params`::
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(Optional, array) Values for parameters in the `query`. For syntax, see
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<<sql-rest-params>>.
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`query`::
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(Required, object) SQL query to run. For syntax, see <<sql-spec>>.
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`request_timeout`::
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(Optional, <<time-units,time value>>) Timeout before the request fails. Defaults
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to `90s` (90 seconds).
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include::{es-repo-dir}/search/search.asciidoc[tag=runtime-mappings-def]
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[[sql-search-api-time-zone]]
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`time_zone`::
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(Optional, string) ISO-8601 time zone ID for the search. Several
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<<sql-functions-datetime,SQL date/time functions>> use this time zone. Defaults
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to `Z` (UTC).
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`wait_for_completion_timeout`::
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(Optional, <<time-units,time value>>) Period to wait for complete results.
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Defaults to no timeout, meaning the request waits for complete search results.
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If the search doesn’t finish within this period, the search becomes
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<<sql-async,async>>.
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+
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To <<sql-store-searches,save a synchronous search>>, you must specify this
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parameter and the `keep_on_completion` parameter.
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[role="child_attributes"]
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[[sql-search-api-response-body]]
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==== {api-response-body-title}
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The SQL search API supports <<sql-rest-format,multiple response formats>>. Most
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response formats use a tabular layout. JSON responses contain the following
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properties:
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`id`::
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(string) Identifier for the search. This value is only returned for
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<<sql-async,async>> and <<sql-store-searches,saved synchronous searches>>. For
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CSV, TSV, and TXT responses, this value is returned in the `Async-ID` HTTP
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header.
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`is_running`::
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(Boolean) If `true`, the search is still running. If `false`, the search has
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finished. This value is only returned for <<sql-async,async>> and
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<<sql-store-searches,saved synchronous searches>>. For CSV, TSV, and TXT
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responses, this value is returned in the `Async-partial` HTTP header.
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`is_partial`::
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(Boolean) If `true`, the response does not contain complete search results. If
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`is_partial` is `true` and `is_running` is `true`, the search is still running.
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If `is_partial` is `true` but `is_running` is `false`, the results are partial
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due to a failure or timeout.
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+
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This value is only returned for <<sql-async,async>> and
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<<sql-store-searches,saved synchronous searches>>. For CSV, TSV, and TXT
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responses, this value is returned in the `Async-partial` HTTP header.
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`rows`::
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(array of arrays)
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Values for the search results.
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`columns`::
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(array of objects)
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Column headings for the search results. Each object is a column.
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+
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.Properties of `columns` objects
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[%collapsible%open]
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====
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`name`::
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(string) Name of the column.
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`type`::
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(string) Data type for the column.
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====
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`cursor`::
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(string) <<sql-pagination,Cursor>> for the next set of paginated results. For
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CSV, TSV, and TXT responses, this value is returned in the `Cursor` HTTP header.
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