org.apache.calcite.rel.rel2sql

Class SqlImplementor

java.lang.Object

org.apache.calcite.rel.rel2sql.SqlImplementor

Direct Known Subclasses:

RelToSqlConverter

public abstract class SqlImplementor
extends Object

State for generating a SQL statement.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	SqlImplementor.AliasContext Implementation of Context that precedes field references with their "table alias" based on the current sub-query's FROM clause.
class	SqlImplementor.Builder Builder.
static class	SqlImplementor.Clause Clauses in a SQL query.
class	SqlImplementor.Context Context for translating a RexNode expression (within a RelNode) into a SqlNode expression (within a SQL parse tree).
(package private) class	SqlImplementor.JoinContext Context for translating ON clause of a JOIN from RexNode to SqlNode.
class	SqlImplementor.MatchRecognizeContext Context for translating MATCH_RECOGNIZE clause
class	SqlImplementor.Result Result of implementing a node.

Field Summary

Fields

Modifier and Type	Field and Description
protected Set<String>	aliasSet
protected Map<CorrelationId,SqlImplementor.Context>	correlTableMap
SqlDialect	dialect
protected Map<String,SqlNode>	ordinalMap
static SqlParserPos	POS

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SqlImplementor(SqlDialect dialect)

Method Summary

Modifier and Type	Method and Description
void	addSelect(List<SqlNode> selectList, SqlNode node, RelDataType rowType)
SqlImplementor.Context	aliasContext(Map<String,RelDataType> aliases, boolean qualified)
private void	collectAliases(com.google.common.collect.ImmutableMap.Builder<String,RelDataType> builder, SqlNode node, Iterator<RelDataType> aliases)
private static int	computeFieldCount(Map<String,RelDataType> aliases)
static SqlNode	convertConditionToSqlNode(RexNode node, SqlImplementor.Context leftContext, SqlImplementor.Context rightContext, int leftFieldCount) Converts a RexNode condition into a SqlNode.
static boolean	isStar(List<RexNode> exps, RelDataType inputRowType, RelDataType projectRowType) Returns whether a list of expressions projects all fields, in order, from the input, with the same names.
static boolean	isStar(RexProgram program)
SqlImplementor.Context	joinContext(SqlImplementor.Context leftContext, SqlImplementor.Context rightContext)
static JoinType	joinType(JoinRelType joinType)
SqlImplementor.Context	matchRecognizeContext(SqlImplementor.Context context)
SqlImplementor.Result	result(SqlNode node, Collection<SqlImplementor.Clause> clauses, RelNode rel, Map<String,RelDataType> aliases) Creates a result based on a single relational expression.
SqlImplementor.Result	result(SqlNode join, SqlImplementor.Result leftResult, SqlImplementor.Result rightResult) Creates a result based on a join.
private static SqlOperator	reverseOperatorDirection(SqlOperator op)
SqlImplementor.Result	setOpToSql(SqlSetOperator operator, RelNode rel)
private static RexNode	stripCastFromString(RexNode node) Removes cast from string.
abstract SqlImplementor.Result	visitChild(int i, RelNode e)
(package private) SqlSelect	wrapSelect(SqlNode node) Wraps a node in a SELECT statement that has no clauses: "SELECT ...

Methods inherited from class java.lang.Object

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

Field Detail

POS

public static final SqlParserPos POS

dialect

public final SqlDialect dialect

aliasSet

protected final Set<String> aliasSet

ordinalMap

protected final Map<String,SqlNode> ordinalMap

correlTableMap

protected final Map<CorrelationId,SqlImplementor.Context> correlTableMap

Constructor Detail

SqlImplementor

protected SqlImplementor(SqlDialect dialect)

Method Detail

visitChild

public abstract SqlImplementor.Result visitChild(int i,
                                                 RelNode e)

addSelect

public void addSelect(List<SqlNode> selectList,
                      SqlNode node,
                      RelDataType rowType)

isStar

public static boolean isStar(List<RexNode> exps,
                             RelDataType inputRowType,
                             RelDataType projectRowType)

Returns whether a list of expressions projects all fields, in order, from the input, with the same names.

isStar

public static boolean isStar(RexProgram program)

setOpToSql

public SqlImplementor.Result setOpToSql(SqlSetOperator operator,
                                        RelNode rel)

convertConditionToSqlNode

public static SqlNode convertConditionToSqlNode(RexNode node,
                                                SqlImplementor.Context leftContext,
                                                SqlImplementor.Context rightContext,
                                                int leftFieldCount)

Converts a RexNode condition into a SqlNode.

Parameters:

node - Join condition

leftContext - Left context

rightContext - Right context

leftFieldCount - Number of fields on left result

Returns:

SqlNode that represents the condition

stripCastFromString

private static RexNode stripCastFromString(RexNode node)

Removes cast from string.

For example, x > CAST('2015-01-07' AS DATE) becomes x > '2015-01-07'.

reverseOperatorDirection

private static SqlOperator reverseOperatorDirection(SqlOperator op)

joinType

public static JoinType joinType(JoinRelType joinType)

result

public SqlImplementor.Result result(SqlNode node,
                                    Collection<SqlImplementor.Clause> clauses,
                                    RelNode rel,
                                    Map<String,RelDataType> aliases)

Creates a result based on a single relational expression.

result

public SqlImplementor.Result result(SqlNode join,
                                    SqlImplementor.Result leftResult,
                                    SqlImplementor.Result rightResult)

Creates a result based on a join. (Each join could contain one or more relational expressions.)

collectAliases

private void collectAliases(com.google.common.collect.ImmutableMap.Builder<String,RelDataType> builder,
                            SqlNode node,
                            Iterator<RelDataType> aliases)

wrapSelect

SqlSelect wrapSelect(SqlNode node)

Wraps a node in a SELECT statement that has no clauses: "SELECT ... FROM (node)".

computeFieldCount

private static int computeFieldCount(Map<String,RelDataType> aliases)

aliasContext

public SqlImplementor.Context aliasContext(Map<String,RelDataType> aliases,
                                           boolean qualified)

joinContext

public SqlImplementor.Context joinContext(SqlImplementor.Context leftContext,
                                          SqlImplementor.Context rightContext)

matchRecognizeContext

public SqlImplementor.Context matchRecognizeContext(SqlImplementor.Context context)