Package org.apache.flink.sql.parser.ddl

Class SqlTableLike

java.lang.Object

org.apache.calcite.sql.SqlNode

org.apache.calcite.sql.SqlCall

org.apache.flink.sql.parser.ddl.SqlTableLike

All Implemented Interfaces:

Cloneable, ExtendedSqlNode

public class SqlTableLike
extends org.apache.calcite.sql.SqlCall
implements ExtendedSqlNode

A LIKE clause in a CREATE TABLE statement.

It enables to use an existing table descriptor to define a new, adjusted/extended table. Users can control the way particular features of both declarations are merged using SqlTableLike.MergingStrategy and SqlTableLike.FeatureOption.

Example: A DDL like the one below for creating a `derived_table`

 CREATE TABLE base_table_1 (
     id BIGINT,
     name STRING,
     tstmp TIMESTAMP,
     PRIMARY KEY(id)
 ) WITH (
     ‘connector’: ‘kafka’,
     ‘connector.starting-offset’: ‘12345’,
     ‘format’: ‘json’
 )

 CREATE TEMPORARY TABLE derived_table (
     WATERMARK FOR tstmp AS tsmp - INTERVAL '5' SECOND
 )
 WITH (
     ‘connector.starting-offset’: ‘0’
 )
 LIKE base_table (
   OVERWRITING OPTIONS,
   EXCLUDING CONSTRAINTS
 )
 

is equivalent to:

 CREATE TEMPORARY TABLE derived_table (
     id BIGINT,
     name STRING,
     tstmp TIMESTAMP,
     WATERMARK FOR tstmp AS tsmp - INTERVAL '5' SECOND
 ) WITH (
     ‘connector’: ‘kafka’,
     ‘connector.starting-offset’: ‘0’,
     ‘format’: ‘json’
 )
 

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SqlTableLike.FeatureOption	A feature of a table descriptor that will be merged into the new table.
static class	SqlTableLike.MergingStrategy	A strategy that describes how the features of the parent source table should be merged with the features of the newly created table.
static class	SqlTableLike.SqlTableLikeOption	A pair of SqlTableLike.MergingStrategy and SqlTableLike.FeatureOption.

Field Summary

Fields inherited from class org.apache.calcite.sql.SqlNode

EMPTY_ARRAY, pos

Constructor Summary

Constructors

Constructor	Description
SqlTableLike(org.apache.calcite.sql.parser.SqlParserPos pos, org.apache.calcite.sql.SqlIdentifier sourceTable, List<SqlTableLike.SqlTableLikeOption> options)

Method Summary

Modifier and Type	Method	Description
List<org.apache.calcite.sql.SqlNode>	getOperandList()
org.apache.calcite.sql.SqlOperator	getOperator()
List<SqlTableLike.SqlTableLikeOption>	getOptions()
org.apache.calcite.sql.SqlIdentifier	getSourceTable()
void	unparse(org.apache.calcite.sql.SqlWriter writer, int leftPrec, int rightPrec)
void	validate()

Methods inherited from class org.apache.calcite.sql.SqlCall

accept, clone, equalsDeep, findValidOptions, getCallSignature, getFunctionQuantifier, getKind, getMonotonicity, isCountStar, isExpanded, operand, operandCount, setOperand, validate

Methods inherited from class org.apache.calcite.sql.SqlNode

clone, clone, cloneArray, equalDeep, equalDeep, equalsDeep, getParserPosition, isA, toList, toList, toSqlString, toSqlString, toSqlString, toString, unparseWithParentheses, validateExpr

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SqlTableLike

public SqlTableLike(org.apache.calcite.sql.parser.SqlParserPos pos,
                    org.apache.calcite.sql.SqlIdentifier sourceTable,
                    List<SqlTableLike.SqlTableLikeOption> options)

Method Detail

getOperator

@Nonnull
public org.apache.calcite.sql.SqlOperator getOperator()

Specified by:

getOperator in class org.apache.calcite.sql.SqlCall

getOperandList

@Nonnull
public List<org.apache.calcite.sql.SqlNode> getOperandList()

Specified by:

getOperandList in class org.apache.calcite.sql.SqlCall

getSourceTable

public org.apache.calcite.sql.SqlIdentifier getSourceTable()

getOptions

public List<SqlTableLike.SqlTableLikeOption> getOptions()

validate

public void validate()
              throws SqlValidateException

Specified by:

validate in interface ExtendedSqlNode

Throws:

SqlValidateException

unparse

public void unparse(org.apache.calcite.sql.SqlWriter writer,
                    int leftPrec,
                    int rightPrec)

Overrides:

unparse in class org.apache.calcite.sql.SqlCall