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Update Opendistro 1.8 releaes notes (#471)
* Update Opendistro 1.8 releaes notes * add #462 * move release notes to release-notes folder
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‎opendistro-elasticsearch-sql.release-notes.md

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‎release-notes/opendistro-elasticsearch-sql.release-notes-0.7.0.md

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## 2019-03-11, Version 0.7.0
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### Notable Changes
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In this release, the following features are added with many other minor improvements and bug fixes.
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* **SQL HAVING**:
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* Add support for SQL HAVING to filter aggregated result after GROUP BY.
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* **SQL Functions**:
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* Common math functions as well as date function are available.
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* **Nested Field Query**:
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* Query nested field in SQL++ syntax instead of explicit nested() function.
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* **JSON in RESTful Request**:
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* Support JSON payload to allow for ESRally benchmark and parameters in JDBC request. And also pretty format and flatten native Elasticsearch DSL as response.
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* **Block Hash Join**:
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* Introduced new query planning framework and new hash join algorithm with memory protection mechanism to perform hash join block by block safely.
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### Major Refactoring & Architecture Changes
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* **Avoid I/O Operation in NIO Thread**
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* Move I/O blocking operations to custom worker thread pool or prefetch to avoid blocking. Meanwhile non-blocking operations still run in Elasticsearch transport thread for efficiency.
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### Commits
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* [[`56dd269`](https://github.com/mauve-hedgehog/opendistro-elasticsearch-sql/commit/56dd269871259dae9fb77ab512005b9a714d728e)] Initial commit

‎release-notes/opendistro-elasticsearch-sql.release-notes-0.8.0.md

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## 2019-04-02, Version 0.8.0
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### Notable Changes
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* Feature [#12](https://github.com/opendistro-for-elasticsearch/sql/issues/12): Add support for Elasticsearch 6.6.2
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* Bug fix [#9](https://github.com/opendistro-for-elasticsearch/sql/issues/9): Fix issue for query by index pattern in JDBC driver.
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* Bug fix [#10](https://github.com/opendistro-for-elasticsearch/sql/issues/10): Return friendly error message instead of NPE for illegal query and other exception cases.

‎release-notes/opendistro-elasticsearch-sql.release-notes-0.9.0.md

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## 2019-04-19, Version 0.9.0
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### Notable Changes
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* Feature [#29](https://github.com/opendistro-for-elasticsearch/sql/issues/29): Add support for Elasticsearch 6.7.1
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* Migration [#17](https://github.com/opendistro-for-elasticsearch/sql/issues/17): Migrate legacy integration tests in Maven to ES test in Gradle.

‎release-notes/opendistro-elasticsearch-sql.release-notes-1.0.0.md

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## 2019-06-10, Version 1.0.0
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### Notable Changes
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* Feature [#47](https://github.com/opendistro-for-elasticsearch/sql/issues/47): Support for Elasticsearch 7.0.1.
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* Feature [#56](https://github.com/opendistro-for-elasticsearch/sql/issues/56): Adding coverage report.
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* Feature [#65](https://github.com/opendistro-for-elasticsearch/sql/issues/65): Support for enabling/disabling SQL feature.
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* BugFix [#44](https://github.com/opendistro-for-elasticsearch/sql/issues/44): Fixing the order of fields in csv output
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* BugFix [#68](https://github.com/opendistro-for-elasticsearch/sql/issues/68): Support number field
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* BugFix [#37](https://github.com/opendistro-for-elasticsearch/sql/issues/37): Fix for PERCENTILES query result in csv output

‎release-notes/opendistro-elasticsearch-sql.release-notes-1.1.0.md

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## 2019-06-21, Version 1.1.0
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### Notable Changes
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* Feature [#90](https://github.com/opendistro-for-elasticsearch/sql/issues/90): Elasticsearch 7.1.1 compatibility
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* Migration [#17](https://github.com/opendistro-for-elasticsearch/sql/issues/17): Finished integ test migration and deprecated Maven build.
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* Enhancement [#34](https://github.com/opendistro-for-elasticsearch/sql/issues/34): Detached request ID from SqlRequest object.
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* BugFix [#46](https://github.com/opendistro-for-elasticsearch/sql/issues/46): Multi-index queries require identical mappings for indices.
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* BugFix [#92](https://github.com/opendistro-for-elasticsearch/sql/issues/92): Improper handling of SELECT statement
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* BugFix [#93](https://github.com/opendistro-for-elasticsearch/sql/issues/93): Blank query causes IndexOutOfBoundsException

‎release-notes/opendistro-elasticsearch-sql.release-notes-1.2.0.md

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## 2019-07-23, Version 1.2.0
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### Notable changes
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* Feature [#125](https://github.com/opendistro-for-elasticsearch/sql/issues/125): Elasticsearch 7.2.0 compatibility
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* Feature [#103](https://github.com/opendistro-for-elasticsearch/sql/issues/103): Sort on custom script based functions
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* BugFix [#104](https://github.com/opendistro-for-elasticsearch/sql/issues/104): GROUP BY and ORDER BY for custom script based functions
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generated wrong DSL
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* BugFix [#95](https://github.com/opendistro-for-elasticsearch/sql/issues/95): NPE thrown when selecting all in query with nested fields involved
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* BugFix [#108](https://github.com/opendistro-for-elasticsearch/sql/issues/108): Custom script based functions weren't supported in JDBC
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and other minor bugfixes

‎release-notes/opendistro-elasticsearch-sql.release-notes-1.2.1.md

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## 2019-10-15, Version 1.2.1
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### Notable changes
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* Feature [#202](https://github.com/opendistro-for-elasticsearch/sql/issues/202): Elasticsearch 7.2.1 compatibility

‎release-notes/opendistro-elasticsearch-sql.release-notes-1.3.0.md

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## 2019-10-29, Version 1.3.0
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### Notable changes
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* Feature [#258](https://github.com/opendistro-for-elasticsearch/sql/issues/185): Elasticsearch 7.3.2 compatibility
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* Feature [#201](https://github.com/opendistro-for-elasticsearch/sql/pull/201): Improve query verification by adding semantic analyzer
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* Enhancement [#262](https://github.com/opendistro-for-elasticsearch/sql/pull/262): Support CASE statement in one more grammer
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* Enhancement [#253](https://github.com/opendistro-for-elasticsearch/sql/pull/253): Support Cast function
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* Enhancement [#260](https://github.com/opendistro-for-elasticsearch/sql/pull/260): Support string operators: ASCII, RTRIM, LTRIM, LOCATE, LENGTH, REPLACE
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* Enhancement [#254](https://github.com/opendistro-for-elasticsearch/sql/issues/254): Support SELECT <number_literal>
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* Enhancement [#251](https://github.com/opendistro-for-elasticsearch/sql/pull/251): Support number operators: POWER, ATAN2, COT, SIGN/SIGNUM
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* Enhancement [#215](https://github.com/opendistro-for-elasticsearch/sql/issues215): Support ordinal in GROUP/ORDER BY clause
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* Enhancement [#213](https://github.com/opendistro-for-elasticsearch/sql/issues/213): Support `<table>.<column>` syntax
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* Enhancement [#212](https://github.com/opendistro-for-elasticsearch/sql/issues/212): Support Quoted identifiers
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* Enhancement [#199](https://github.com/opendistro-for-elasticsearch/sql/issues/199): Support NOT operator with nested field query
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* Enhancement [#166](https://github.com/opendistro-for-elasticsearch/sql/issues/166): Support pretty option for explain request
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* Enhancement [#162](https://github.com/opendistro-for-elasticsearch/sql/issues/162): Support ORDER BY for 2 or more columns sorts only by last column in aggregation query
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* Enhancement [#151](https://github.com/opendistro-for-elasticsearch/sql/issues/151): Improve query verification and exception handling
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* Enhancement [#128](https://github.com/opendistro-for-elasticsearch/sql/issues/128): Support case-changing functions
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* Enhancement [#120](https://github.com/opendistro-for-elasticsearch/sql/issues/120): Support aggregation function in HAVING
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* Enhancement [#82](https://github.com/opendistro-for-elasticsearch/sql/issues/82): Pre-verification before actual execution of query
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* Enhancement [#75](https://github.com/opendistro-for-elasticsearch/sql/issues/75): Support order by on SQL functions like SUM etc
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* BugFix [#265](https://github.com/opendistro-for-elasticsearch/sql/pull/265): Fix the LOG function that delivered inaccurate result
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* BugFix [#233](https://github.com/opendistro-for-elasticsearch/sql/issues/233): Function names are case-sensitive
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* BugFix [#191](https://github.com/opendistro-for-elasticsearch/sql/issues/191): Fix new syntax check for LEFT JOIN on nested field and metadata field
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* BugFix [#188](https://github.com/opendistro-for-elasticsearch/sql/issues/188): Having doesn't working on nested field
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* BugFix [#187](https://github.com/opendistro-for-elasticsearch/sql/issues/187): Aggregation on Nested Array Field return unexpected value
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* BugFix [#186](https://github.com/opendistro-for-elasticsearch/sql/issues/186): Alias of group key is not returned correctly
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* BugFix [#176](https://github.com/opendistro-for-elasticsearch/sql/issues/176): ORDER BY expects function names written only in lowercase
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* BugFix [#175](https://github.com/opendistro-for-elasticsearch/sql/issues/175): ORDER BY doesn't respect table aliases
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* BugFix [#170](https://github.com/opendistro-for-elasticsearch/sql/issues/170): Some flaky test cases fail and pass after retry
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* BugFix [#158](https://github.com/opendistro-for-elasticsearch/sql/issues/158): Aliases aren't working for ORDER BY and GROUP BY
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* BugFix [#132](https://github.com/opendistro-for-elasticsearch/sql/issues/132): Integration Test Cluster doesn't terminated when integration test failed
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* BugFix [#125](https://github.com/opendistro-for-elasticsearch/sql/issues/125): Parsing Exception when WHERE clause has true/false in CONDITION
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* BugFix [#122](https://github.com/opendistro-for-elasticsearch/sql/issues/122): Query with custom-function doesn't respect LIMIT
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* BugFix [#121](https://github.com/opendistro-for-elasticsearch/sql/issues/121): Dot/period at start of index name fails to parse
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* BugFix [#111](https://github.com/opendistro-for-elasticsearch/sql/issues/111): JDBC format of aggregation query with date_format adds unnecessary column bug

‎release-notes/opendistro-elasticsearch-sql.release-notes-1.4.0.md

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## 2020-01-24, Version 1.4.0
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### Features
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#### Elasticsearch Compatibility
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* Feature [#312](https://github.com/opendistro-for-elasticsearch/sql/issues/312): Elasticsearch 7.4.2 compatibility
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#### Testing
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* Feature ([#335](https://github.com/opendistro-for-elasticsearch/sql/pull/335), [#343](https://github.com/opendistro-for-elasticsearch/sql/pull/343)): Sql test bench bug fix, improvement and more test cases (issues: [#335](https://github.com/opendistro-for-elasticsearch/sql/issues/335), [#339](https://github.com/opendistro-for-elasticsearch/sql/issues/339))
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#### Documentation
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* Feature ([#302](https://github.com/opendistro-for-elasticsearch/sql/pull/302), [#305](https://github.com/opendistro-for-elasticsearch/sql/pull/305), [#303](https://github.com/opendistro-for-elasticsearch/sql/pull/303)): Documentation for basic usage of plugin & improvement of contributing docs (issues: [#293](https://github.com/opendistro-for-elasticsearch/sql/issues/293), [#243](https://github.com/opendistro-for-elasticsearch/sql/issues/243))
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#### Github Actions
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* Feature ([#283](https://github.com/opendistro-for-elasticsearch/sql/pull/283), [#287](https://github.com/opendistro-for-elasticsearch/sql/pull/287)): Added github action to build and run tests. Gradle build will publish compiled plugin, that is ready to install into elastic
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### Enhancements
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#### Lexer and Semantic
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* Enhancement [#345](https://github.com/opendistro-for-elasticsearch/sql/pull/345): Syntax and semantic exceptions handling for unsupported features (issue: [#320](https://github.com/opendistro-for-elasticsearch/sql/issues/320))
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#### SQL Feature
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* Enhancement ([#346](https://github.com/opendistro-for-elasticsearch/sql/pull/346), [#352](https://github.com/opendistro-for-elasticsearch/sql/pull/352)): Support function over aggregation result (issues: [#194](https://github.com/opendistro-for-elasticsearch/sql/issues/194), [#229](https://github.com/opendistro-for-elasticsearch/sql/issues/229), [#270](https://github.com/opendistro-for-elasticsearch/sql/issues/270), [#292](https://github.com/opendistro-for-elasticsearch/sql/issues/292))
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* Enhancement [#273](https://github.com/opendistro-for-elasticsearch/sql/pull/273): Support conditional functions: IF, IFNULL, ISNULL (issues: [#224](https://github.com/opendistro-for-elasticsearch/sql/issues/224), [#235](https://github.com/opendistro-for-elasticsearch/sql/issues/235))
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* Enhancement [#274](https://github.com/opendistro-for-elasticsearch/sql/pull/274): Support JOIN without table alias (issue: [#232](https://github.com/opendistro-for-elasticsearch/sql/issues/232))
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* Enhancement [#278](https://github.com/opendistro-for-elasticsearch/sql/pull/278): Support subquery in from with parent only has select (issue: [#230](https://github.com/opendistro-for-elasticsearch/sql/issues/230))
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* Enhancement [#282](https://github.com/opendistro-for-elasticsearch/sql/pull/282): Support datetime functions: MONTH, DAYOFMONTH, DATE, MONTHNAME, TIMESTAMP, MAKETIME, NOW, CURDATE (issue: [#235](https://github.com/opendistro-for-elasticsearch/sql/issues/235))
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* Enhancement [#300](https://github.com/opendistro-for-elasticsearch/sql/pull/300): Support DISTINCT feature in SELECT clause (issue: [#294](https://github.com/opendistro-for-elasticsearch/sql/issues/294))
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#### Response
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* Enhancement [#334](https://github.com/opendistro-for-elasticsearch/sql/pull/334): Change the default response format to JDBC (issue: [#159](https://github.com/opendistro-for-elasticsearch/sql/issues/159))
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### Bugfixes
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* BugFix [#267](https://github.com/opendistro-for-elasticsearch/sql/pull/267): Fixed operatorReplace Integration Test (issue: [#266](https://github.com/opendistro-for-elasticsearch/sql/issues/266))
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* BugFix [#275](https://github.com/opendistro-for-elasticsearch/sql/pull/275): Fix issue that IP type cannot pass JDBC formatter (issue: [#272](https://github.com/opendistro-for-elasticsearch/sql/issues/272))
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* BugFix [#284](https://github.com/opendistro-for-elasticsearch/sql/pull/284): Fixed flaky test suite, that was breaking Github action build
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* BugFix [#295](https://github.com/opendistro-for-elasticsearch/sql/pull/295): Corrected the selected field names displayed in the schema of JDBC formatted response (issue: [#290](https://github.com/opendistro-for-elasticsearch/sql/issues/290))
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* BugFix [#296](https://github.com/opendistro-for-elasticsearch/sql/pull/296): Fixed functions work improperly with fieldvalue/constant param for current use (issues: [#279](https://github.com/opendistro-for-elasticsearch/sql/issues/279), [#291](https://github.com/opendistro-for-elasticsearch/sql/issues/291), [#224](https://github.com/opendistro-for-elasticsearch/sql/issues/224))
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* BugFix [#298](https://github.com/opendistro-for-elasticsearch/sql/pull/298): Fixed issue of log10 function gets inaccurate results （issue: [#297](https://github.com/opendistro-for-elasticsearch/sql/issues/297))
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* BugFix [#307](https://github.com/opendistro-for-elasticsearch/sql/pull/307): Fix the issue of column alias not working for GROUP BY (issue: [#299](https://github.com/opendistro-for-elasticsearch/sql/issues/299))
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* BugFix [#333](https://github.com/opendistro-for-elasticsearch/sql/pull/333): Fixed the issue of substring not working correctly when fieldname is put as <table>.<column> (issue: [#330](https://github.com/opendistro-for-elasticsearch/sql/issues/330))
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* BugFix [#337](https://github.com/opendistro-for-elasticsearch/sql/pull/337): Fix JDBC response for delete query (issue: [#131](https://github.com/opendistro-for-elasticsearch/sql/issues/131))

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