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[SPARK-49543][SQL] Add SHOW COLLATIONS command
### What changes were proposed in this pull request? Add SHOW COLLATIONS SQL syntax to list all Spark built-in collations. Supports optional LIKE pattern filtering (e.g. SHOW COLLATIONS LIKE 'UNICODE*'). Output schema: NAME, LANGUAGE, COUNTRY, ACCENT_SENSITIVITY, CASE_SENSITIVITY, PAD_ATTRIBUTE, ICU_VERSION — matching the existing collations() TVF but without the constant CATALOG/SCHEMA columns. Implementation follows the ShowCatalogsCommand pattern as collations are engine-global and not tied to any catalog or namespace. ### Why are the changes needed? SHOW COLLATIONS is a SQL command supported by MySQL and its derivatives (MariaDB, TiDB) for listing available collations. Spark currently only exposes this information via a table-valued function (SELECT * FROM collations()), which is inconsistent with how other catalog objects are queried (SHOW CATALOGS, SHOW TABLES, etc.) and unfamiliar to users coming from MySQL-compatible databases. This change adds a more intuitive SQL syntax consistent with Spark's existing SHOW command family. ### Does this PR introduce _any_ user-facing change? Yes, this adds `SHOW COLLATIONS` command. ### How was this patch tested? Unit tests ### Was this patch authored or co-authored using generative AI tooling? Generated-by: Claude Sonnet 4.6 Closes #55099 from viirya/SPARK-49543-show-collations. Authored-by: Liang-Chi Hsieh <viirya@gmail.com> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
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‎docs/sql-ref-ansi-compliance.md‎

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|CODEGEN|non-reserved|non-reserved|non-reserved|
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|COLLATE|reserved|non-reserved|reserved|
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|COLLATION|reserved|non-reserved|reserved|
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|COLLATIONS|reserved|non-reserved|non-reserved|
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|COLLECTION|non-reserved|non-reserved|non-reserved|
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|COLUMN|reserved|non-reserved|reserved|
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|COLUMNS|non-reserved|non-reserved|non-reserved|

‎docs/sql-ref-syntax-aux-show-collations.md‎

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---
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layout: global
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title: SHOW COLLATIONS
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displayTitle: SHOW COLLATIONS
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license: |
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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---
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### Description
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Returns the list of collations supported by Spark. An optional pattern may be used to filter
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the results. The `LIKE` clause is optional.
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### Syntax
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```sql
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SHOW COLLATIONS [ LIKE regex_pattern ]
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```
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### Parameters
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* **regex_pattern**
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Specifies the regular expression pattern that is used to filter the results of the statement.
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* Except for `*` and `|` character, the pattern works like a regular expression.
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* `*` alone matches 0 or more characters and `|` is used to separate multiple different regular expressions,
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any of which can match.
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* The leading and trailing blanks are trimmed in the input pattern before processing. The pattern match is case-insensitive.
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### Output
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The output has the following columns:
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| Column | Type | Nullable | Description |
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|--------|------|----------|-------------|
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| NAME | STRING | No | The name of the collation. |
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| LANGUAGE | STRING | Yes | The display language of the locale, or `null` for locale-independent collations. |
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| COUNTRY | STRING | Yes | The display country of the locale, or `null` for locale-independent collations. |
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| ACCENT_SENSITIVITY | STRING | No | Whether the collation is accent-sensitive (`ACCENT_SENSITIVE`) or accent-insensitive (`ACCENT_INSENSITIVE`). |
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| CASE_SENSITIVITY | STRING | No | Whether the collation is case-sensitive (`CASE_SENSITIVE`) or case-insensitive (`CASE_INSENSITIVE`). |
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| PAD_ATTRIBUTE | STRING | No | The pad attribute of the collation: `NO_PAD` or `RTRIM`. |
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| ICU_VERSION | STRING | Yes | The ICU library version used for the collation, or `null` for non-ICU collations such as `UTF8_BINARY` and `UTF8_LCASE`. |
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### Examples
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```sql
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-- List all supported collations (results truncated)
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SHOW COLLATIONS;
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+-----------------+--------+-------+------------------+----------------+-------------+-----------+
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| NAME|LANGUAGE|COUNTRY|ACCENT_SENSITIVITY|CASE_SENSITIVITY|PAD_ATTRIBUTE|ICU_VERSION|
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+-----------------+--------+-------+------------------+----------------+-------------+-----------+
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| UTF8_BINARY| null| null| ACCENT_SENSITIVE| CASE_SENSITIVE| NO_PAD| null|
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| UTF8_LCASE| null| null| ACCENT_SENSITIVE|CASE_INSENSITIVE| NO_PAD| null|
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| UNICODE| null| null| ACCENT_SENSITIVE| CASE_SENSITIVE| NO_PAD| 78.2|
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| UNICODE_CI| null| null| ACCENT_SENSITIVE|CASE_INSENSITIVE| NO_PAD| 78.2|
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| en_USA| English| United States|ACCENT_SENSITIVE|CASE_SENSITIVE| NO_PAD| 78.2|
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| en_USA_CI| English| United States|ACCENT_SENSITIVE|CASE_INSENSITIVE| NO_PAD| 78.2|
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| ...| ...| ...| ...| ...| ...| ...|
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+-----------------+--------+-------+------------------+----------------+-------------+-----------+
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-- List all collations matching `UTF8_BINARY*`
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SHOW COLLATIONS LIKE 'UTF8_BINARY*';
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+-----------------+--------+-------+------------------+----------------+-------------+-----------+
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| NAME|LANGUAGE|COUNTRY|ACCENT_SENSITIVITY|CASE_SENSITIVITY|PAD_ATTRIBUTE|ICU_VERSION|
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+-----------------+--------+-------+------------------+----------------+-------------+-----------+
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| UTF8_BINARY| null| null| ACCENT_SENSITIVE| CASE_SENSITIVE| NO_PAD| null|
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| UTF8_BINARY_RTRIM| null| null| ACCENT_SENSITIVE| CASE_SENSITIVE| RTRIM| null|
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+-----------------+--------+-------+------------------+----------------+-------------+-----------+
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-- List all collations matching `UNICODE*`
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SHOW COLLATIONS LIKE 'UNICODE*';
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+--------------+--------+-------+-------------------+----------------+-------------+-----------+
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| NAME|LANGUAGE|COUNTRY| ACCENT_SENSITIVITY|CASE_SENSITIVITY|PAD_ATTRIBUTE|ICU_VERSION|
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+--------------+--------+-------+-------------------+----------------+-------------+-----------+
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| UNICODE| null| null| ACCENT_SENSITIVE| CASE_SENSITIVE| NO_PAD| 78.2|
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| UNICODE_AI| null| null| ACCENT_INSENSITIVE| CASE_SENSITIVE| NO_PAD| 78.2|
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| UNICODE_AI_RTRIM| null| null|ACCENT_INSENSITIVE|CASE_SENSITIVE| RTRIM| 78.2|
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| UNICODE_CI| null| null| ACCENT_SENSITIVE|CASE_INSENSITIVE| NO_PAD| 78.2|
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| UNICODE_CI_AI| null| null| ACCENT_INSENSITIVE|CASE_INSENSITIVE| NO_PAD| 78.2|
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|UNICODE_CI_AI_RTRIM| null| null|ACCENT_INSENSITIVE|CASE_INSENSITIVE| RTRIM| 78.2|
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| UNICODE_CI_RTRIM| null| null| ACCENT_SENSITIVE|CASE_INSENSITIVE| RTRIM| 78.2|
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| UNICODE_RTRIM| null| null| ACCENT_SENSITIVE| CASE_SENSITIVE| RTRIM| 78.2|
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+--------------+--------+-------+-------------------+----------------+-------------+-----------+
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-- List all collations matching `UNICODE` or `UTF8_BINARY`
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SHOW COLLATIONS LIKE 'UNICODE|UTF8_BINARY';
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+-----------+--------+-------+------------------+----------------+-------------+-----------+
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| NAME|LANGUAGE|COUNTRY|ACCENT_SENSITIVITY|CASE_SENSITIVITY|PAD_ATTRIBUTE|ICU_VERSION|
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+-----------+--------+-------+------------------+----------------+-------------+-----------+
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|UTF8_BINARY| null| null| ACCENT_SENSITIVE| CASE_SENSITIVE| NO_PAD| null|
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| UNICODE| null| null| ACCENT_SENSITIVE| CASE_SENSITIVE| NO_PAD| 78.2|
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+-----------+--------+-------+------------------+----------------+-------------+-----------+
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```
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### Related Statements
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* [STRING TYPE](sql-ref-datatypes.html)

‎docs/sql-ref-syntax.md‎

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* [SET](sql-ref-syntax-aux-conf-mgmt-set.html)
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* [SET VAR](sql-ref-syntax-aux-set-var.html)
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* [SHOW CACHED TABLES](sql-ref-syntax-aux-show-cached-tables.html)
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* [SHOW COLLATIONS](sql-ref-syntax-aux-show-collations.html)
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* [SHOW COLUMNS](sql-ref-syntax-aux-show-columns.html)
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* [SHOW CREATE TABLE](sql-ref-syntax-aux-show-create-table.html)
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* [SHOW DATABASES](sql-ref-syntax-aux-show-databases.html)

‎sql/api/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseLexer.g4‎

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CODEGEN: 'CODEGEN';
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COLLATE: 'COLLATE';
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COLLATION: 'COLLATION';
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COLLATIONS: 'COLLATIONS';
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COLLECTION: 'COLLECTION';
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COLUMN: 'COLUMN';
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COLUMNS: 'COLUMNS';

‎sql/api/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseParser.g4‎

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| SHOW CREATE TABLE identifierReference (AS SERDE)? #showCreateTable
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| SHOW CURRENT namespace #showCurrentNamespace
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| SHOW CATALOGS (LIKE? pattern=stringLit)? #showCatalogs
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| SHOW COLLATIONS (LIKE? pattern=stringLit)? #showCollations
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| (DESC | DESCRIBE) FUNCTION EXTENDED? describeFuncName #describeFunction
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| (DESC | DESCRIBE) PROCEDURE identifierReference #describeProcedure
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| (DESC | DESCRIBE) namespace EXTENDED?
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| CODEGEN
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| COLLATE
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| COLLATION
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| COLLATIONS
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| COLLECTION
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| COLUMN
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| COLUMNS

‎sql/connect/client/jdbc/src/test/scala/org/apache/spark/sql/connect/client/jdbc/SparkConnectDatabaseMetaDataSuite.scala‎

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withConnection { conn =>
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val metadata = conn.getMetaData
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// scalastyle:off line.size.limit
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assert(metadata.getSQLKeywords === "ADD,AFTER,AGGREGATE,ALWAYS,ANALYZE,ANTI,ANY_VALUE,ARCHIVE,ASC,BINDING,BUCKET,BUCKETS,BYTE,CACHE,CACHED,CASCADE,CATALOG,CATALOGS,CHANGE,CHANGES,CLEAR,CLUSTER,CLUSTERED,CODEGEN,COLLATION,COLLECTION,COLUMNS,COMMENT,COMPACT,COMPACTIONS,COMPENSATION,COMPUTE,CONCATENATE,CONTAINS,CONTINUE,COST,DATA,DATABASE,DATABASES,DATEADD,DATEDIFF,DATE_ADD,DATE_DIFF,DAYOFYEAR,DAYS,DBPROPERTIES,DEFINED,DEFINER,DELAY,DELIMITED,DESC,DFS,DIRECTORIES,DIRECTORY,DISTRIBUTE,DIV,DO,ELSEIF,ENFORCED,ESCAPED,EVOLUTION,EXCHANGE,EXCLUDE,EXCLUSIVE,EXIT,EXPLAIN,EXPORT,EXTEND,EXTENDED,FIELDS,FILEFORMAT,FIRST,FLOW,FOLLOWING,FORMAT,FORMATTED,FOUND,FUNCTIONS,GENERATED,GEOGRAPHY,GEOMETRY,HANDLER,HOURS,IDENTIFIED,IDENTIFIER,IF,IGNORE,ILIKE,IMMEDIATE,INCLUDE,INCLUSIVE,INCREMENT,INDEX,INDEXES,INPATH,INPUT,INPUTFORMAT,INVOKER,ITEMS,ITERATE,JSON,KEY,KEYS,LAST,LAZY,LEAVE,LEVEL,LIMIT,LINES,LIST,LOAD,LOCATION,LOCK,LOCKS,LOGICAL,LONG,LOOP,MACRO,MAP,MATCHED,MATERIALIZED,MEASURE,METRICS,MICROSECOND,MICROSECONDS,MILLISECOND,MILLISECONDS,MINUS,MINUTES,MONTHS,MSCK,NAME,NAMESPACE,NAMESPACES,NANOSECOND,NANOSECONDS,NORELY,NULLS,OFFSET,OPTION,OPTIONS,OUTPUTFORMAT,OVERWRITE,PARTITIONED,PARTITIONS,PERCENT,PIVOT,PLACING,PRECEDING,PRINCIPALS,PROCEDURES,PROPERTIES,PURGE,QUARTER,QUERY,RECORDREADER,RECORDWRITER,RECOVER,RECURSION,REDUCE,REFRESH,RELY,RENAME,REPAIR,REPEAT,REPEATABLE,REPLACE,RESET,RESPECT,RESTRICT,ROLE,ROLES,SCHEMA,SCHEMAS,SECONDS,SECURITY,SEMI,SEPARATED,SERDE,SERDEPROPERTIES,SETS,SHORT,SHOW,SINGLE,SKEWED,SORT,SORTED,SOURCE,STATISTICS,STORED,STRATIFY,STREAM,STREAMING,STRING,STRUCT,SUBSTR,SYNC,SYSTEM_TIME,SYSTEM_VERSION,TABLES,TARGET,TBLPROPERTIES,TERMINATED,TIMEDIFF,TIMESTAMPADD,TIMESTAMPDIFF,TIMESTAMP_LTZ,TIMESTAMP_NTZ,TINYINT,TOUCH,TRANSACTION,TRANSACTIONS,TRANSFORM,TRUNCATE,TRY_CAST,TYPE,UNARCHIVE,UNBOUNDED,UNCACHE,UNLOCK,UNPIVOT,UNSET,UNTIL,USE,VAR,VARIABLE,VARIANT,VERSION,VIEW,VIEWS,VOID,WATERMARK,WEEK,WEEKS,WHILE,X,YEARS,ZONE")
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assert(metadata.getSQLKeywords === "ADD,AFTER,AGGREGATE,ALWAYS,ANALYZE,ANTI,ANY_VALUE,ARCHIVE,ASC,BINDING,BUCKET,BUCKETS,BYTE,CACHE,CACHED,CASCADE,CATALOG,CATALOGS,CHANGE,CHANGES,CLEAR,CLUSTER,CLUSTERED,CODEGEN,COLLATION,COLLATIONS,COLLECTION,COLUMNS,COMMENT,COMPACT,COMPACTIONS,COMPENSATION,COMPUTE,CONCATENATE,CONTAINS,CONTINUE,COST,DATA,DATABASE,DATABASES,DATEADD,DATEDIFF,DATE_ADD,DATE_DIFF,DAYOFYEAR,DAYS,DBPROPERTIES,DEFINED,DEFINER,DELAY,DELIMITED,DESC,DFS,DIRECTORIES,DIRECTORY,DISTRIBUTE,DIV,DO,ELSEIF,ENFORCED,ESCAPED,EVOLUTION,EXCHANGE,EXCLUDE,EXCLUSIVE,EXIT,EXPLAIN,EXPORT,EXTEND,EXTENDED,FIELDS,FILEFORMAT,FIRST,FLOW,FOLLOWING,FORMAT,FORMATTED,FOUND,FUNCTIONS,GENERATED,GEOGRAPHY,GEOMETRY,HANDLER,HOURS,IDENTIFIED,IDENTIFIER,IF,IGNORE,ILIKE,IMMEDIATE,INCLUDE,INCLUSIVE,INCREMENT,INDEX,INDEXES,INPATH,INPUT,INPUTFORMAT,INVOKER,ITEMS,ITERATE,JSON,KEY,KEYS,LAST,LAZY,LEAVE,LEVEL,LIMIT,LINES,LIST,LOAD,LOCATION,LOCK,LOCKS,LOGICAL,LONG,LOOP,MACRO,MAP,MATCHED,MATERIALIZED,MEASURE,METRICS,MICROSECOND,MICROSECONDS,MILLISECOND,MILLISECONDS,MINUS,MINUTES,MONTHS,MSCK,NAME,NAMESPACE,NAMESPACES,NANOSECOND,NANOSECONDS,NORELY,NULLS,OFFSET,OPTION,OPTIONS,OUTPUTFORMAT,OVERWRITE,PARTITIONED,PARTITIONS,PERCENT,PIVOT,PLACING,PRECEDING,PRINCIPALS,PROCEDURES,PROPERTIES,PURGE,QUARTER,QUERY,RECORDREADER,RECORDWRITER,RECOVER,RECURSION,REDUCE,REFRESH,RELY,RENAME,REPAIR,REPEAT,REPEATABLE,REPLACE,RESET,RESPECT,RESTRICT,ROLE,ROLES,SCHEMA,SCHEMAS,SECONDS,SECURITY,SEMI,SEPARATED,SERDE,SERDEPROPERTIES,SETS,SHORT,SHOW,SINGLE,SKEWED,SORT,SORTED,SOURCE,STATISTICS,STORED,STRATIFY,STREAM,STREAMING,STRING,STRUCT,SUBSTR,SYNC,SYSTEM_TIME,SYSTEM_VERSION,TABLES,TARGET,TBLPROPERTIES,TERMINATED,TIMEDIFF,TIMESTAMPADD,TIMESTAMPDIFF,TIMESTAMP_LTZ,TIMESTAMP_NTZ,TINYINT,TOUCH,TRANSACTION,TRANSACTIONS,TRANSFORM,TRUNCATE,TRY_CAST,TYPE,UNARCHIVE,UNBOUNDED,UNCACHE,UNLOCK,UNPIVOT,UNSET,UNTIL,USE,VAR,VARIABLE,VARIANT,VERSION,VIEW,VIEWS,VOID,WATERMARK,WEEK,WEEKS,WHILE,X,YEARS,ZONE")
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// scalastyle:on line.size.limit
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}
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}

‎sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala‎

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ShowCatalogsCommand(Option(ctx.pattern).map(x => string(visitStringLit(x))))
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}
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/**
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* Create a [[ShowCollationsCommand]] logical command.
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*/
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override def visitShowCollations(ctx: ShowCollationsContext): LogicalPlan = withOrigin(ctx) {
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ShowCollationsCommand(Option(ctx.pattern).map(x => string(visitStringLit(x))))
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}
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/**
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* Converts a multi-part identifier to a TableIdentifier.
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*

‎sql/core/src/main/scala/org/apache/spark/sql/execution/command/ShowCollationsCommand.scala‎

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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.spark.sql.execution.command
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import scala.jdk.CollectionConverters._
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import org.apache.spark.sql.{Row, SparkSession}
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import org.apache.spark.sql.catalyst.expressions.{Attribute, AttributeReference}
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import org.apache.spark.sql.catalyst.util.{CollationFactory, StringUtils}
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import org.apache.spark.sql.types.StringType
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/**
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* The command for `SHOW COLLATIONS`.
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*/
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case class ShowCollationsCommand(pattern: Option[String]) extends LeafRunnableCommand {
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override val output: Seq[Attribute] = Seq(
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AttributeReference("NAME", StringType, nullable = false)(),
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AttributeReference("LANGUAGE", StringType, nullable = true)(),
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AttributeReference("COUNTRY", StringType, nullable = true)(),
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AttributeReference("ACCENT_SENSITIVITY", StringType, nullable = false)(),
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AttributeReference("CASE_SENSITIVITY", StringType, nullable = false)(),
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AttributeReference("PAD_ATTRIBUTE", StringType, nullable = false)(),
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AttributeReference("ICU_VERSION", StringType, nullable = true)())
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override def run(sparkSession: SparkSession): Seq[Row] = {
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val collations = CollationFactory.listCollations().asScala
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.map(CollationFactory.loadCollationMeta)
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val filtered = pattern
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.map(p => collations.filter(m => StringUtils.filterPattern(Seq(m.collationName), p).nonEmpty))
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.getOrElse(collations)
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filtered.map { m =>
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Row(
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m.collationName,
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m.language,
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m.country,
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if (m.accentSensitivity) "ACCENT_SENSITIVE" else "ACCENT_INSENSITIVE",
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if (m.caseSensitivity) "CASE_SENSITIVE" else "CASE_INSENSITIVE",
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m.padAttribute,
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m.icuVersion)
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}.toSeq
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}
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}

‎sql/core/src/test/resources/sql-tests/results/keywords-enforced.sql.out‎

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CODEGEN false
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COLLATE true
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COLLATION true
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COLLATIONS true
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COLLECTION false
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COLUMN true
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COLUMNS false
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CHECK
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COLLATE
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COLLATION
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COLLATIONS
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COLUMN
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CONSTRAINT
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CREATE

‎sql/core/src/test/resources/sql-tests/results/keywords.sql.out‎

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CODEGEN false
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COLLATE false
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COLLATION false
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COLLATIONS false
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COLLECTION false
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COLUMN false
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COLUMNS false

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