Discussion thread | https://lists.apache.org/thread/l5xx9lgg70y6cbktk810yv4xzx701b0454fyd27m8on1cf3hn6dz564zqmkobjyd | ||||||||
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Vote thread | https://lists.apache.org/thread/bc0qcmg73t4q7do3k657rqcdx1vyjqzy | ||||||||
JIRA |
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Release |
Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).
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But these features are not very complete compared with other popular engines such as spark, hive, presto . And these improved features are very useful for users or developers.
show | Support or Not | Support filter or Not |
show tables | Yes | Yes |
show columns | Yes | Yes |
show catalogs | Yes | No |
show databases | Yes | No |
show functions | Yes | No |
show views | Yes | No |
show modules | Yes | No |
show jars | Yes | No |
show jobs | Yes | No |
We can see current flink many sql statements only support showing with full datas, without 'FROM/IN' or 'LIKE' filter clause.
show create | Support or Not |
show create database | No |
show create table | Yes |
show create view | Yes |
show create function | No |
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describe
...
Support or Not
...
note
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describe catalog
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No
...
has sqlNode but not support in table api
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describe database
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No
...
has sqlNode but not support in table api
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describe table
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Yes
...
describe function
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No
...
describe view
...
No
current flink only supports describing tables.
So we propose this flip, try to support these features.
Proposed Syntax Changes:
We compare flink with other popular engines and give an improved syntax example. Welcome everyone to discuss and improve the final syntax.
Because it may be modified under discuss, we put it on the google docs. please see FLIP-297: Improve Auxiliary Sql Statements Docs
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before
...
after(under discussed)
...
Note
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show catalogs
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SHOW CATALOGS
...
show databases
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SHOW DATABASES
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SHOW DATABASES [ ( FROM | IN ) catalog_name] [ [NOT] LIKE <sql_like_pattern> ]
...
show functions
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SHOW [USER] FUNCTIONS
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SHOW [USER] FUNCTIONS [ ( FROM | IN ) [catalog_name.]database_name ] [ [NOT] LIKE <sql_like_pattern> ]
and commercial engines such as snowflake.
For example, many popular engines support show operation with filtering except flink, and support describe many objects(flink only supports describe table).
And these improved features are very useful for users and developers.
Comparison with other popular engines
Because each engine has its own personalized auxiliary sql statements features, here are some common operations listed as much as possible, and compare what other unrealized abilities of flink.
We focus on standard sql, but also consider absorbing the syntax of some mature engines to let users know that this is not standard, just for better use (e.g. ILIKE).
show catalogs
Engine | Support or Not, If support show the syntax |
Flink | SHOW CATALOGS |
Spark | No |
Hive | No |
Presto | SHOW CATALOGS [ LIKE pattern ] |
MySQL | No |
SnowFlake | No |
show databases
Engine | Support or Not, If support show the syntax |
Flink | SHOW DATABASES |
Spark | SHOW { DATABASES | SCHEMAS } [ LIKE regex_pattern ] |
Hive | SHOW (DATABASES|SCHEMAS) [LIKE 'identifier_with_wildcards'] |
Presto | SHOW SCHEMAS [ FROM catalog ] [ LIKE pattern ] |
MySQL | SHOW {DATABASES | SCHEMAS} [LIKE 'pattern' | WHERE expr] |
SnowFlake | SHOW [ TERSE ] DATABASES [ HISTORY ] [ LIKE '<pattern>' ] [ STARTS WITH '<name_string>' ] [ LIMIT <rows> [ FROM '<name_string>' ] ] |
show functions
Engine | Support or Not, If support show the syntax |
Flink | SHOW [USER] FUNCTIONS |
Spark | SHOW [ function_kind ] FUNCTIONS [ { FROM | IN } database_name ] [ LIKE regex_pattern ] |
Hive | SHOW FUNCTIONS [LIKE "<pattern>"] |
Presto | SHOW FUNCTIONS [ LIKE pattern [ ESCAPE 'escape_character' ] ] |
MySQL | SELECT ROUTINE_NAME FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'FUNCTION' ORDER BY ROUTINE_NAME; |
SnowFlake | SHOW FUNCTIONS [ LIKE '<pattern>' ] [ IN { ACCOUNT | DATABASE | DATABASE <database_name> | SCHEMA | SCHEMA <schema_name> | <schema_name> } ] |
show views
Engine | Support or Not, If support show the syntax |
Flink | SHOW VIEWS |
Spark | SHOW VIEWS [ { FROM | IN } database_name ] [ LIKE regex_pattern ] |
Hive | SHOW VIEWS [IN/FROM database_name] [LIKE 'pattern_with_wildcards'] |
Presto | No |
MySQL | SHOW FULL TABLES [FROM db_name] [LIKE 'pattern' | WHERE expr] (Alternative syntax) |
SnowFlake | SHOW [ TERSE ] VIEWS [ LIKE '<pattern>' ] [ IN { ACCOUNT | DATABASE [ <db_name> ] | [ SCHEMA ] [ <schema_name> ] } ] [ STARTS WITH '<name_string>' ] [ LIMIT <rows> [ FROM '<name_string>' ] ] |
show modules
Engine | Support or Not, If support show the syntax |
Flink | SHOW [FULL] MODULES |
Spark | No |
Hive | No |
Presto | No |
MySQL | No |
SnowFlake | No |
show jars
Engine | Support or Not, If support show the syntax | Note |
Flink | SHOW JARS | only work in SQL CLI or SQL Gateway. |
Spark | No | |
Hive | No | |
Presto | No | |
MySQL | No | |
SnowFlake | No |
show jobs
Engine | Support or Not, If support show the syntax | Note |
Flink | SHOW JOBS | only work in SQL CLI or SQL Gateway. |
Spark | No | |
Hive | No | |
Presto | No | |
MySQL | No | |
SnowFlake | No |
show create database
Engine | Support or Not, If support show the syntax | Note |
Flink | No | |
Spark | No | |
Hive | No | |
Presto | No | |
MySQL | SHOW CREATE {DATABASE | SCHEMA} [IF NOT EXISTS] db_name | RDBMS, such as Oracle, MariaDB, TiDB also support it. |
SnowFlake | No |
show create function
Engine | Support or Not, If support show the syntaxes | Note |
Flink | No | |
Spark | No | |
Hive | No | |
Presto | SHOW CREATE FUNCTION function_name [ ( parameter_type[, ...] ) ] | |
MySQL | SHOW CREATE FUNCTION func_name | RDBMS, such as Oracle, MariaDB, TiDB also support it. |
SnowFlake | No |
describe catalog
Engine | Support or Not, If support show the syntaxes | Note |
Flink | No | with catalog-database-table three layer |
Spark | No | with database-table layer. schema and database they mean the same thing. But databricks on aws support it: |
Hive | No | with database-table layer. schema and database they mean the same thing |
Presto | No | Presto is schema-database-table three layer. schema and database are not equal. |
MySQL | No | with database-table layer. schema and database they mean the same thing. |
SnowFlake | DESC[RIBE] DATABASE <database_name> | SnowFlake is database-schema-table three layer. database may act as catalog. |
describe database
Engine | Support or Not, If support show the syntaxes | Note |
Flink | { DESC | DESCRIBE } DATABASE [ EXTENDED ] db_name | just sqlNode, but not expose to table & sql api |
Spark | { DESC | DESCRIBE } DATABASE [ EXTENDED ] db_name | |
Hive | DESCRIBE DATABASE [EXTENDED] db_name; DESCRIBE SCHEMA [EXTENDED] db_name; | |
Presto | No | |
MySQL | No | |
SnowFlake | DESC[RIBE] SCHEMA <schema_name> |
describe function
Engine | Support or Not, If support show the syntaxes | Note |
Flink | No | |
Spark | { DESC | DESCRIBE } FUNCTION [ EXTENDED ] function_name | |
Hive | DESCRIBEFUNCTION [EXTENDED] <function_name> | |
Presto | No | |
MySQL | No | |
SnowFlake | DESC[RIBE] FUNCTION <name> ( [ <arg_data_type> ] [ , ... ] ) |
describe view
Engine | Support or Not, If support show the syntaxes | Note |
Flink | No | |
Spark | No | |
Hive | DESCRIBE [EXTENDED|FORMATTED] <view_name>; | |
Presto | No | |
MySQL | No | |
SnowFlake | DESC[RIBE] VIEW <name> |
We can see many popular engines have filtering with show statements, support 'FROM/IN' or 'LIKE/ILIKE' filter clause except flink.
And currently flink only supports describing tables. And also some unique statements such as show jars/show modules in flink can also support this feature.
So we proposed this FLIP.
Proposed Syntax Changes:
Note: we both support LIKE and ILIKE in this FLIP.
LIKE: sql_like_pattern, case sensitive
ILIKE: sql_like_pattern, same behavior as LIKE except case insensitive
And For consistency, we will add ILIKE support for query either.
Because calcite already support parse ILIKE and exist SqlLikeOperator(SqlLibraryOperators.ILIKE, not std operator). We just need to support it in table & sql api (no need to modify sql keywords and Parser.jj).
before | after(under discussed) | Note | |
show catalogs | SHOW CATALOGS | SHOW CATALOGS[ [NOT] (LIKE | ILIKE) <sql_like_pattern> ] | |
show databases | SHOW DATABASES | SHOW DATABASES [ ( FROM | IN ) catalog_name] [ [NOT] (LIKE | ILIKE) <sql_like_pattern> ] | |
show tables | SHOW TABLES [ ( FROM | IN ) [catalog_name.]database_name ] [ [NOT] LIKE <sql_like_pattern> ] | SHOW TABLES [ ( FROM | IN ) [catalog_name.]database_name ] [ [NOT] (LIKE | ILIKE) <sql_like_pattern> ] | |
show columns | SHOW COLUMNS ( FROM | IN ) [[catalog_name.]database.]<table_name> [ [NOT] LIKE <sql_like_pattern>] | SHOW COLUMNS ( FROM | IN ) [[catalog_name.]database.]<table_name> [ [NOT] (LIKE | ILIKE) <sql_like_pattern>] | |
show functions | SHOW [USER] FUNCTIONS | SHOW [USER] FUNCTIONS [ ( FROM | IN ) [catalog_name.]database_name ] [ [NOT] (LIKE | ILIKE) <sql_like_pattern> ] | |
show views | SHOW VIEWS | SHOW VIEWS [ ( FROM | IN ) [catalog_name.]database_name ] [ [NOT] (LIKE | ILIKE) <sql_like_pattern> ] | |
show modules | SHOW [FULL] MODULES | SHOW [FULL] MODULES [ [NOT] (LIKE | ILIKE) <sql_like_pattern> ] | |
show jars | SHOW JARS | SHOW JARS [ [NOT] (LIKE | ILIKE) <sql_like_pattern> ] | only work in SQL CLI or SQL Gateway. |
show jobs | SHOW JOBS | SHOW JOBS [ [NOT] (LIKE | ILIKE) <sql_like_pattern> ] | only work in SQL CLI or SQL Gateway. |
describe catalog | Not Support | { DESCRIBE | DESC } CATALOG [ EXTENDED ] catalog_name If the optional | |
describe database | Not Support | { DESCRIBE | DESC } DATABASE [ EXTENDED ] [catalog_name.]database_name If the optional | |
describe function | Not Support | { DESCRIBE | DESC } FUNCTION [ EXTENDED ] [[catalog_name.]database_name.]function_name If the optional | |
... |
Proposed CataLog API Changes:
No need to add new apis (there is a discussion about api changes, pls see the discuss thread).
We can use such as TableEnvironment.getCatalog(catalogName).get().listDatabases(), TableEnvironment.getCatalog(catalogName).get().listFunctions(databaseName) for util to get result.
In TableEnvironmentImpl we do filter for returned full results.
Some SqlNodes and Operations could be added or changed.
Code Block | ||||||
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// Add SqlDescribeCatalog & DescribeCatalogOperation
// Add SqlDescribeDatabase & DescribeDatabaseOperation
// Add SqlDescribeFunction & DescribeFunctionOperation
About DescribeCatalog:
+-------------------------+-----------------------------+
| catalog_description_item| catalog_description_value |
+-------------------------+-----------------------------+
| Catalog Name | xxx |
| Properties| (key1=val1, key2=val2, ...) |
+-------------------------+-----------------------------+
About DescribeDatabase:
+-------------------------+-----------------------------+
|database_description_item| database_description_value|
+-------------------------+-----------------------------+
| Database Name| employees|
| Description| For software companies|
| Properties| (key1=val1, key2=val2, ...) |
+-------------------------+-----------------------------+
About DescribeFunction:
+-------------------------+-----------------------------+
|function_description_item| function_description_value|
+-------------------------+-----------------------------+
| Function Name | ABS |
| Function Language| JAVA |
| Resource Uri | file://xxx |
| Details | details |
+-------------------------+-----------------------------+
The concrete describe infos we can get from the specific catalog object.
// Changed SqlNodes & Operations
// SqlShowCatalogs
public class SqlShowCatalogs extends SqlCall {
public static final SqlSpecialOperator OPERATOR =
new SqlSpecialOperator("SHOW CATALOGS", SqlKind.OTHER);
protected final SqlLikeType likeType;
protected final boolean notLike;
protected final SqlCharStringLiteral likeLiteral;
public SqlShowCatalogs(SqlParserPos pos) {
super(pos);
this.likeType = null;
this.notLike = false;
this.likeLiteral = null;
}
public SqlShowCatalogs(
SqlParserPos pos, String likeType, boolean notLike, SqlCharStringLiteral likeLiteral) {
super(pos);
if (likeType != null) {
this.likeType = SqlLikeType.of(likeType);
this.likeLiteral = requireNonNull(likeLiteral, "Like pattern must not be null");
} else {
this.likeType = null;
this.likeLiteral = null;
}
this.notLike = notLike;
}
public SqlLikeType getLikeType() {
return likeType;
}
public boolean isLike() {
return likeType == SqlLikeType.LIKE;
}
public boolean isILike() {
return likeType == SqlLikeType.ILIKE;
}
public boolean isWithLike() {
return isLike() || isILike();
}
public boolean isNotLike() {
return notLike;
}
public String getLikeSqlPattern() {
return Objects.isNull(likeLiteral) ? null : likeLiteral.getValueAs(String.class);
}
@Override
public SqlOperator getOperator() {
return OPERATOR;
}
@Override
public List<SqlNode> getOperandList() {
return Collections.emptyList();
}
@Override
public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
writer.keyword("SHOW CATALOGS");
if (isWithLike()) {
if (isNotLike()) {
writer.keyword(String.format("NOT %s '%s'", likeType.name(), getLikeSqlPattern()));
} else {
writer.keyword(String.format("%s '%s'", likeType.name(), getLikeSqlPattern()));
}
}
}
}
// ShowCatalogsOperation
public class ShowCatalogsOperation implements ShowOperation {
private final OperationLikeType likeType;
private final boolean notLike;
private final String likePattern;
/** Use when there is no sub-clause. */
public ShowCatalogsOperation() {
this.likeType = null;
this.notLike = false;
this.likePattern = null;
}
/** Use when there is like. */
public ShowCatalogsOperation(String likeType, boolean notLike, String likePattern) {
this.likeType = OperationLikeType.of(checkNotNull(likeType, "Like type must not be null"));
this.likePattern = checkNotNull(likePattern, "Like pattern must not be null");
this.notLike = notLike;
}
public boolean isLike() {
return likeType == OperationLikeType.LIKE;
}
public boolean isIlike() {
return likeType == OperationLikeType.ILIKE;
}
public boolean isWithLike() {
return isLike() || isIlike();
}
public boolean isNotLike() {
return notLike;
}
public String getLikePattern() {
return likePattern;
}
@Override
public String asSummaryString() {
StringBuilder builder = new StringBuilder().append("SHOW CATALOGS");
if (isWithLike()) {
if (notLike) {
builder.append(String.format(" NOT %s %s", likeType.name(), likePattern));
} else {
builder.append(String.format(" %s %s", likeType.name(), likePattern));
}
}
return builder.toString();
}
}
// SqlShowDatabases
public class SqlShowDatabases extends SqlCall {
public static final SqlSpecialOperator OPERATOR =
new SqlSpecialOperator("SHOW DATABASES", SqlKind.OTHER);
protected final String preposition;
protected final SqlIdentifier catalogName;
protected final SqlLikeType likeType;
protected final boolean notLike;
protected final SqlCharStringLiteral likeLiteral;
public SqlShowDatabases(SqlParserPos pos) {
super(pos);
this.preposition = null;
this.catalogName = null;
this.likeType = null;
this.notLike = false;
this.likeLiteral = null;
}
public SqlShowDatabases(
SqlParserPos pos,
String preposition,
SqlIdentifier catalogName,
String likeType,
boolean notLike,
SqlCharStringLiteral likeLiteral) {
super(pos);
this.preposition = preposition;
this.catalogName =
preposition != null
? requireNonNull(catalogName, "Catalog name must not be null.")
: null;
if (likeType != null) {
this.likeType = SqlLikeType.of(likeType);
this.likeLiteral = requireNonNull(likeLiteral, "Like pattern must not be null");
} else {
this.likeType = null;
this.likeLiteral = null;
}
this.notLike = notLike;
}
public String getPreposition() {
return preposition;
}
public SqlIdentifier getCatalogName( |
...
show views
...
SHOW VIEWS
...
SHOW VIEWS [ ( FROM | IN ) [catalog_name.]database_name ] [ [NOT] LIKE <sql_like_pattern> ]
...
show modules
...
SHOW [FULL] MODULES
...
SHOW [FULL] MODULES [ [NOT] LIKE <sql_like_pattern> ]
...
show jars
...
SHOW JARS
...
SHOW JARS [ [NOT] LIKE <sql_like_pattern> ]
...
only work in SQL CLI or SQL Gateway.
...
show jobs
...
SHOW JOBS
...
SHOW JOBS [ [NOT] LIKE <sql_like_pattern> ]
...
only work in SQL CLI or SQL Gateway.
...
describe catalog
...
Not Support
...
{ DESCRIBE | DESC } CATALOG catalog_name
...
describe database
...
Not Support
...
{ DESCRIBE | DESC } DATABASE [ EXTENDED ] db_name
...
describe function
...
Not Support
...
{ DESCRIBE | DESC } FUNCTION [ EXTENDED ] function_name
...
...
Proposed TableEnvironment SQL API Changes:
Code Block | ||||||
---|---|---|---|---|---|---|
| ||||||
public interface TableEnvironment {
/**
* Gets the names of all databases registered in the specific catalog.
*
* @param catalogName specific catalogName
* @return A list of the names of all registered databases in the specific catalog.
*/
String[] listDatabases(String catalogName);
/**
* Gets the names of all functions with specific catalog and database in this environment.
*
* @param catalogName specific catalogName
* @param databaseName specific databaseName
* @return A list of the names of all functions with the specific catalog and database.
*/
String[] listFunctions(String catalogName, String databaseName);
/**
* Gets the names of all views available with the specific catalog and database. It returns both
* temporary and permanent views.
*
* @param catalogName specific catalogName
* @param databaseName specific databaseName
* @return A list of the names of all registered views with the specific catalog and database.
*/
String[] listViews(String catalogName, String databaseName);
} |
Code Block | ||||||
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| ||||||
// ShowCatalogsOperation public class ShowCatalogsOperation implements ShowOperation { private final boolean useLike; private final boolean notLike; private final String likePattern; public ShowCatalogsOperation(boolean useLike, boolean notLike, String likePattern) { this.useLike = useLikereturn catalogName; } public this.notLike = notLike;String catalogName() { this.likePattern return catalogName != likePattern; null ? catalogName.getSimple() : }null; @Override} public StringSqlLikeType asSummaryStringgetLikeType() { return "SHOW CATALOGS"likeType; } } // ShowDatabasesOperation public class ShowDatabasesOperation implements ShowOperation public boolean isLike() { private final String catalogName; return likeType == SqlLikeType.LIKE; private final boolean useLike;} privatepublic finalboolean boolean notLike;isILike() { private final String likePattern; return likeType == SqlLikeType.ILIKE; private final String preposition;} public boolean ShowDatabasesOperationisNotLike() { return notLike; String catalogName,} public boolean isWithLike() { boolean useLike, return isLike() || isILike(); boolean notLike,} public SqlCharStringLiteral getLikeLiteral() { String likePattern, return likeLiteral; } public String prepositiongetLikeSqlPattern() { this.catalogName = catalogName; this.useLike = useLikereturn Objects.isNull(likeLiteral) ? null : likeLiteral.getValueAs(String.class); this.notLike = notLike;} @Override public this.likePattern = likePattern;SqlOperator getOperator() { this.preposition = prepositionreturn OPERATOR; } @Override public StringList<SqlNode> asSummaryStringgetOperandList() { return "SHOW DATABASES"; Objects.isNull(this.catalogName) } } // ShowFunctionsOperation public class ShowFunctionsOperation implements ShowOperation { private final String catalogName; ? Collections.emptyList() private final String databaseName; private final boolean useLike: Collections.singletonList(catalogName); private} final boolean notLike;@Override privatepublic finalvoid String likePattern; private final String preposition; unparse(SqlWriter writer, int leftPrec, int rightPrec) { private final FunctionScope functionScope; /**if (this.preposition == null) { * Represent scope of function. *writer.keyword("SHOW DATABASES"); * <ul> } else if *(catalogName != <li><b>USER</b> return only user-defined functions null) { * <li><b>ALL</b> return all user-defined and built-in functions writer.keyword("SHOW DATABASES " + this.preposition); * </ul> catalogName.unparse(writer, */leftPrec, rightPrec); public enum FunctionScope {} USER,if (isWithLike()) { ALL } if (isNotLike()) { public ShowFunctionsOperation( String catalogName,writer.keyword(String.format("NOT %s '%s'", likeType.name(), getLikeSqlPattern())); String databaseName,} else { boolean useLike, writer.keyword(String.format("%s '%s'", boolean notLike,likeType.name(), getLikeSqlPattern())); String likePattern,} } String preposition, } // ShowDatabasesOperation public class ShowDatabasesOperation implements ShowOperation { private final FunctionScope functionScope) {String preposition; private final this.catalogName = String catalogName; private final OperationLikeType this.databaseName = databaseName; likeType; private final boolean notLike; private this.useLikefinal =String useLikelikePattern; /** Use when this.notLike = notLike; there is no sub-clause. */ this.likePattern = likePattern;public ShowDatabasesOperation() { this.preposition = prepositionnull; this.functionScopecatalogName = functionScopenull; } @Override this.likeType public String asSummaryString() {= null; if (functionScope == FunctionScope.ALL) { return "SHOW FUNCTIONS"this.notLike = false; }this.likePattern else= {null; } /** Use when there is returnonly String.format("SHOW %s FUNCTIONS", functionScope); }like. */ public ShowDatabasesOperation(String likeType, boolean notLike, String likePattern) { } publicthis.preposition FunctionScope getFunctionScope() { = null; this.catalogName return= functionScopenull; } } // ShowViewsOperation public class ShowViewsOperation implementsthis.likeType ShowOperation { private final String catalogName; private final String databaseName; private final boolean useLike; private final boolean= OperationLikeType.of(checkNotNull(likeType, "Like type must not be null")); this.likePattern = checkNotNull(likePattern, "Like pattern must not be null"); this.notLike = notLike; private} final String likePattern; /** Use when privatethere finalis String preposition; preposition. */ public ShowViewsOperationShowDatabasesOperation( String catalogNamepreposition, String databaseNamecatalogName, booleanString useLikelikeType, boolean notLike, String likePattern,) { this.preposition = checkNotNull(preposition, "Preposition must not Stringbe prepositionnull") {; this.catalogName = checkNotNull(catalogName; , "Catalog name must not be null"); this.databaseName = databaseName; if (likeType != this.useLike = useLike; null) { this.notLikelikeType = notLikeOperationLikeType.of(likeType); this.likePattern = checkNotNull(likePattern; , this.preposition = preposition"Like pattern must not be null"); } @Override } else { public String asSummaryString() { this.likeType return "SHOW VIEWS"= null; } } // ShowModulesOperation public class ShowModulesOperation implements ShowOperation { this.likePattern = privatenull; final boolean requireFull; private final} boolean useLike; private finalthis.notLike boolean= notLike; private final String likePattern;} public String ShowModulesOperationgetPreposition() { return preposition; boolean requireFull,} boolean useLike, boolean notLike,public String likePatterngetCatalogName() { this.requireFull = requireFull; return catalogName; } public boolean isLike() { return this.useLikelikeType == useLikeOperationLikeType.LIKE; } this.notLike = notLike;public boolean isIlike() { this.likePatternreturn likeType == likePatternOperationLikeType.ILIKE; } @Overridepublic boolean isWithLike() { public String asSummaryString() { return isLike() || isIlike(); } public boolean isNotLike() { return requireFull ? "SHOW FULL MODULES" : "SHOW MODULES"return notLike; } public booleanString requireFullgetLikePattern() { return requireFulllikePattern; } } // ShowJarsOperation public class ShowJarsOperation implements ShowOperation {@Override privatepublic finalString boolean useLike;asSummaryString() { private final boolean notLike; StringBuilder builder = private final String likePattern; new StringBuilder().append("SHOW DATABASES"); public ShowJarsOperation(boolean useLike, booleanif notLike, String likePattern(preposition != null) { this.useLike = useLike builder.append(String.format(" %s %s", preposition, catalogName)); this.notLike = notLike;} this.likePattern = likePattern;if (isWithLike()) { } @Override public Stringif asSummaryString(notLike) { return "SHOW JARS"; } } // ShowJobsOperation public class ShowJobsOperation implements ShowOperation { builder.append(String.format(" NOT %s %s", likeType.name(), likePattern)); private final boolean useLike; private final} booleanelse notLike; { private final String likePattern; public ShowJobsOperation(boolean useLike, boolean notLike, String likePattern) { builder.append(String.format(" %s %s", likeType.name(), likePattern)); this.useLike = useLike; } this.notLike = notLike;} this.likePattern = likePatternreturn builder.toString(); } } // omit here. @Override basically same as public String asSummaryString() { return "SHOW JOBS"; } } |
Future Work
ShowCatalogs/ShowDatabases above.
// SqlShowFunctions & ShowFunctionsOperation
// SqlShowViews & ShowViewsOperation
// SqlShowModules & ShowModulesOperation
// SqlShowJars & ShowJarsOperation
// SqlShowJobs & ShowJobsOperation |
Future Work
TBD.to be added
Compatibility, Deprecation, and Migration Plan
No compatibility and migrationmigration. We will ensure changes of this FLIP will be compatible with current flink behavior.
Test Plan
Add new cases to cover these features.
...