org.apache.calcite.rel.rel2sql

Class SqlImplementor.Context

java.lang.Object

org.apache.calcite.rel.rel2sql.SqlImplementor.Context

Direct Known Subclasses:

SqlImplementor.BaseContext, SqlImplementor.SimpleContext

Enclosing class:

SqlImplementor

public abstract static class SqlImplementor.Context
extends Object

Context for translating a RexNode expression (within a RelNode) into a SqlNode expression (within a SQL parse tree).

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Context(SqlDialect dialect, int fieldCount)
protected	Context(SqlDialect dialect, int fieldCount, boolean ignoreCast)

Method Summary

Modifier and Type	Method and Description
abstract SqlNode	field(int ordinal)
List<SqlNode>	fieldList()
protected SqlImplementor.Context	getAliasContext(RexCorrelVariable variable)
abstract SqlImplementor	implementor()
SqlNode	orderField(int ordinal) Creates a reference to a field to be used in an ORDER BY clause.
protected RexCall	reverseCall(RexCall call) Reverses the order of a call, while preserving semantics, if it improves readability.
SqlNode	toSql(AggregateCall aggCall) Converts a call to an aggregate function to an expression.
SqlNode	toSql(RelFieldCollation collation) Converts a collation to an ORDER BY item.
SqlNode	toSql(@Nullable RexProgram program, RexNode rex) Converts an expression from RexNode to SqlNode format.
SqlNode	toSql(RexWindowBound rexWindowBound) Converts an expression from RexWindowBound to SqlNode format.
List<SqlNode>	toSql(Window.Group group, com.google.common.collect.ImmutableList<RexLiteral> constants, int inputFieldCount)

Methods inherited from class java.lang.Object

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

Constructor Detail

Context

protected Context(SqlDialect dialect,
                  int fieldCount)

Context

protected Context(SqlDialect dialect,
                  int fieldCount,
                  boolean ignoreCast)

Method Detail

field

public abstract SqlNode field(int ordinal)

orderField

public SqlNode orderField(int ordinal)

Creates a reference to a field to be used in an ORDER BY clause.

By default, it returns the same result as field(int).

If the field has an alias, uses the alias. If the field is an unqualified column reference which is the same an alias, switches to a qualified column reference.

toSql

public SqlNode toSql(@Nullable RexProgram program,
                     RexNode rex)

Converts an expression from RexNode to SqlNode format.

Parameters:

program - Required only if rex contains RexLocalRef

rex - Expression to convert

reverseCall

protected RexCall reverseCall(RexCall call)

Reverses the order of a call, while preserving semantics, if it improves readability.

In the base implementation, this method does nothing; in a join context, reverses a call such as "e.deptno = d.deptno" to "d.deptno = e.deptno" if "d" is the left input to the join and "e" is the right.

toSql

public SqlNode toSql(RexWindowBound rexWindowBound)

Converts an expression from RexWindowBound to SqlNode format.

Parameters:

rexWindowBound - Expression to convert

toSql

public List<SqlNode> toSql(Window.Group group,
                           com.google.common.collect.ImmutableList<RexLiteral> constants,
                           int inputFieldCount)

getAliasContext

protected SqlImplementor.Context getAliasContext(RexCorrelVariable variable)

fieldList

public List<SqlNode> fieldList()

toSql

public SqlNode toSql(AggregateCall aggCall)

Converts a call to an aggregate function to an expression.

toSql

public SqlNode toSql(RelFieldCollation collation)

Converts a collation to an ORDER BY item.

implementor

public abstract SqlImplementor implementor()