org.apache.calcite

Interface DataContext

All Known Implementing Classes:

VisitorDataContext

public interface DataContext

Runtime context allowing access to the tables in a database.

See Also:

DataContexts

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	DataContext.Variable Variable that may be asked for in a call to get(java.lang.String).

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.calcite.linq4j.tree.ParameterExpression	ROOT

Method Summary

Modifier and Type	Method and Description
@Nullable Object	get(String name) Returns a context variable.
org.apache.calcite.linq4j.QueryProvider	getQueryProvider() Returns the query provider.
@Nullable SchemaPlus	getRootSchema() Returns a sub-schema with a given name, or null.
JavaTypeFactory	getTypeFactory() Returns the type factory.

Field Detail

ROOT

static final org.apache.calcite.linq4j.tree.ParameterExpression ROOT

Method Detail

getRootSchema

@Nullable SchemaPlus getRootSchema()

Returns a sub-schema with a given name, or null.

getTypeFactory

JavaTypeFactory getTypeFactory()

Returns the type factory.

getQueryProvider

org.apache.calcite.linq4j.QueryProvider getQueryProvider()

Returns the query provider.

get

@Nullable Object get(String name)

Returns a context variable.

Supported variables include: "sparkContext", "currentTimestamp", "localTimestamp".

Parameters:

name - Name of variable