org.apache.calcite.rel.rel2sql

Class SqlImplementor.Result

java.lang.Object

org.apache.calcite.rel.rel2sql.SqlImplementor.Result

Enclosing class:

SqlImplementor

public class SqlImplementor.Result
extends Object

Result of implementing a node.

Constructor Summary

Constructors

Constructor and Description
Result(SqlNode node, Collection<SqlImplementor.Clause> clauses, @Nullable String neededAlias, @Nullable RelDataType neededType, Map<String,RelDataType> aliases)

Method Summary

Modifier and Type	Method and Description
SqlNode	asFrom() Returns a node that can be included in the FROM clause or a JOIN.
SqlNode	asQueryOrValues() Converts a non-query node into a SELECT node.
SqlSelect	asSelect() Converts a non-query node into a SELECT node.
SqlNode	asStatement() Converts a non-query node into a SELECT node.
SqlImplementor.Builder	builder(RelNode rel) Creates a builder for the SQL of the given relational expression, using the clauses that you declared when you called SqlImplementor.visitInput(RelNode, int, Set).
SqlImplementor.Builder	builder(RelNode rel, SqlImplementor.Clause clause, SqlImplementor.Clause... clauses) Deprecated. Provide the expected clauses up-front, when you call SqlImplementor.visitInput(RelNode, int, Set), then create a builder using builder(RelNode).
SqlImplementor.Clause	maxClause() Deprecated.
SqlImplementor.Context	qualifiedContext() Returns a context that always qualifies identifiers.
SqlImplementor.Result	resetAlias() In join, when the left and right nodes have been generated, update their alias with 'neededAlias' if not null.
SqlImplementor.Result	resetAlias(String alias, RelDataType type) Sets the alias of the join or correlate just created.
void	stripTrivialAliases(SqlNode node)
SqlSelect	subSelect()

Methods inherited from class java.lang.Object

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

Constructor Detail

Result

public Result(SqlNode node,
              Collection<SqlImplementor.Clause> clauses,
              @Nullable String neededAlias,
              @Nullable RelDataType neededType,
              Map<String,RelDataType> aliases)

Method Detail

builder

public SqlImplementor.Builder builder(RelNode rel)

Creates a builder for the SQL of the given relational expression, using the clauses that you declared when you called SqlImplementor.visitInput(RelNode, int, Set).

builder

@Deprecated
public SqlImplementor.Builder builder(RelNode rel,
                                                  SqlImplementor.Clause clause,
                                                  SqlImplementor.Clause... clauses)

Deprecated. Provide the expected clauses up-front, when you call SqlImplementor.visitInput(RelNode, int, Set), then create a builder using builder(RelNode).

maxClause

@Deprecated
public SqlImplementor.Clause maxClause()

Deprecated.

Returns the highest clause that is in use.

asFrom

public SqlNode asFrom()

Returns a node that can be included in the FROM clause or a JOIN. It has an alias that is unique within the query. The alias is implicit if it can be derived using the usual rules (For example, "SELECT * FROM emp" is equivalent to "SELECT * FROM emp AS emp".)

subSelect

public SqlSelect subSelect()

asSelect

public SqlSelect asSelect()

Converts a non-query node into a SELECT node. Set operators (UNION, INTERSECT, EXCEPT) remain as is.

stripTrivialAliases

public void stripTrivialAliases(SqlNode node)

asStatement

public SqlNode asStatement()

Converts a non-query node into a SELECT node. Set operators (UNION, INTERSECT, EXCEPT) and DML operators (INSERT, UPDATE, DELETE, MERGE) remain as is.

asQueryOrValues

public SqlNode asQueryOrValues()

Converts a non-query node into a SELECT node. Set operators (UNION, INTERSECT, EXCEPT) and VALUES remain as is.

qualifiedContext

public SqlImplementor.Context qualifiedContext()

Returns a context that always qualifies identifiers. Useful if the Context deals with just one arm of a join, yet we wish to generate a join condition that qualifies column names to disambiguate them.

resetAlias

public SqlImplementor.Result resetAlias()

In join, when the left and right nodes have been generated, update their alias with 'neededAlias' if not null.

resetAlias

public SqlImplementor.Result resetAlias(String alias,
                                        RelDataType type)

Sets the alias of the join or correlate just created.

Parameters:

alias - New alias

type - type of the node associated with the alias