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elasticsearch/docs/reference/esql/functions/left.asciidoc

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Restructure ES|QL docs (#100806) * Break out 'Limitations' into separate page * Add REST API docs * Restructure commands, functions, and operators refs * Add placeholder for getting started guide * Group 'Syntax', 'Metafields', and 'MV fields' under 'Language' * Add placeholder for Kibana page * Add link from landing page * Apply uniform formatting to ACOS, CASE, and DATE_PARSE function refs * Reword default LIMIT * Add support for COUNT(*) * Move 'Commands' and 'Functions and operators' to individual pages --------- Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
2023-10-17 23:36:14 +08:00
[discrete]
Implement the 'left' function in issue #98545 (#98942) @nik9000 Recheck out the main branch. Refactor the 'left' function to cut the prefix string in place. But I meet a adversity that left failed the test case 'testEvaluateInManyThreads'. I find that in multiple thread situation, ` EvalOperator.ExpressionEvaluator eval = evalSupplier.get(); for (int c = 0; c < count; c++) { assertThat(toJavaObject(eval.eval(page), 0), testCase.getMatcher()); } ` toJavaObject function return a BytesRef with length=2, content is [81,89]. However, assertThat function in junit4 receive the BytesRef parameters that its length is 10. Can you give me some clues? I can't find which variable is mutual. Rerun failed test case's command: `gradlew ':x-pack:plugin:esql:test' --tests "org.elasticsearch.xpack.esql.expression.function.scalar.string.LeftTests.testEvaluateInManyThreads {TestCase=Left basic test}" -Dtests.seed=44459C172243712 -Dtests.locale=lv-LV -Dtests.timezone=Asia/Irkutsk -Druntime.java=20`
2023-08-29 01:17:16 +08:00
[[esql-left]]
=== `LEFT`
ESQL: Implement 'right' function (#98974) Add the 'right' function, which extracts a substring beginning from its right end (opposite function of 'left'). --------- Co-authored-by: Alexander Spies <alexander.spies@elastic.co>
2023-09-08 23:27:59 +08:00
[.text-center]
image::esql/functions/signature/left.svg[Embedded,opts=inline]
Implement the 'left' function in issue #98545 (#98942) @nik9000 Recheck out the main branch. Refactor the 'left' function to cut the prefix string in place. But I meet a adversity that left failed the test case 'testEvaluateInManyThreads'. I find that in multiple thread situation, ` EvalOperator.ExpressionEvaluator eval = evalSupplier.get(); for (int c = 0; c < count; c++) { assertThat(toJavaObject(eval.eval(page), 0), testCase.getMatcher()); } ` toJavaObject function return a BytesRef with length=2, content is [81,89]. However, assertThat function in junit4 receive the BytesRef parameters that its length is 10. Can you give me some clues? I can't find which variable is mutual. Rerun failed test case's command: `gradlew ':x-pack:plugin:esql:test' --tests "org.elasticsearch.xpack.esql.expression.function.scalar.string.LeftTests.testEvaluateInManyThreads {TestCase=Left basic test}" -Dtests.seed=44459C172243712 -Dtests.locale=lv-LV -Dtests.timezone=Asia/Irkutsk -Druntime.java=20`
2023-08-29 01:17:16 +08:00
ESQL: Implement 'right' function (#98974) Add the 'right' function, which extracts a substring beginning from its right end (opposite function of 'left'). --------- Co-authored-by: Alexander Spies <alexander.spies@elastic.co>
2023-09-08 23:27:59 +08:00
Return the substring that extracts 'length' chars from the 'string' starting from the left.
Implement the 'left' function in issue #98545 (#98942) @nik9000 Recheck out the main branch. Refactor the 'left' function to cut the prefix string in place. But I meet a adversity that left failed the test case 'testEvaluateInManyThreads'. I find that in multiple thread situation, ` EvalOperator.ExpressionEvaluator eval = evalSupplier.get(); for (int c = 0; c < count; c++) { assertThat(toJavaObject(eval.eval(page), 0), testCase.getMatcher()); } ` toJavaObject function return a BytesRef with length=2, content is [81,89]. However, assertThat function in junit4 receive the BytesRef parameters that its length is 10. Can you give me some clues? I can't find which variable is mutual. Rerun failed test case's command: `gradlew ':x-pack:plugin:esql:test' --tests "org.elasticsearch.xpack.esql.expression.function.scalar.string.LeftTests.testEvaluateInManyThreads {TestCase=Left basic test}" -Dtests.seed=44459C172243712 -Dtests.locale=lv-LV -Dtests.timezone=Asia/Irkutsk -Druntime.java=20`
2023-08-29 01:17:16 +08:00
[source.merge.styled,esql]
----
include::{esql-specs}/string.csv-spec[tag=left]
----
[%header.monospaced.styled,format=dsv,separator=|]
|===
include::{esql-specs}/string.csv-spec[tag=left-result]
|===
ESQL: Implement 'right' function (#98974) Add the 'right' function, which extracts a substring beginning from its right end (opposite function of 'left'). --------- Co-authored-by: Alexander Spies <alexander.spies@elastic.co>
2023-09-08 23:27:59 +08:00
Supported types:
include::types/left.asciidoc[]