org.apache.beam.sdk.extensions.sql.meta.provider

Class FullNameTableProvider

java.lang.Object

org.apache.beam.sdk.extensions.sql.meta.provider.FullNameTableProvider

All Implemented Interfaces:

CustomTableResolver, TableProvider

Direct Known Subclasses:

DataCatalogTableProvider

public abstract class FullNameTableProvider
extends java.lang.Object
implements TableProvider, CustomTableResolver

Base class for table providers that look up table metadata using full table names, instead of querying it by parts of the name separately.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	FullNameTableProvider()

Method Summary

Modifier and Type	Method and Description
TableProvider	getSubProvider(java.lang.String name) Returns a sub-provider, e.g.
abstract Table	getTableByFullName(TableName fullTableName)
void	registerKnownTableNames(java.util.List<TableName> tableNames) Register the table names as extracted from the FROM clause.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.beam.sdk.extensions.sql.meta.provider.TableProvider

buildBeamSqlTable, createTable, dropTable, getSubProviders, getTable, getTables, getTableType

Constructor Detail

FullNameTableProvider

protected FullNameTableProvider()

Method Detail

getTableByFullName

public abstract Table getTableByFullName(TableName fullTableName)

registerKnownTableNames

public void registerKnownTableNames(java.util.List<TableName> tableNames)

Description copied from interface: CustomTableResolver

Register the table names as extracted from the FROM clause.

Calcite doesn't provide these full names to table providers and queries them with individual parts of the identifiers without giving any extra context. So if a table provider needs to implement some custom table name resolution strategy it doesn't have information to do so. E.g. if you want to take the compound SQL identifiers that were originally split by dots, join them into a single string, and then query a back-end service, this interface makes this possible.

Specified by:

registerKnownTableNames in interface CustomTableResolver

getSubProvider

public TableProvider getSubProvider(java.lang.String name)

Description copied from interface: TableProvider

Returns a sub-provider, e.g. sub-schema. Temporary, this logic needs to live in BeamCalciteSchema.

Specified by:

getSubProvider in interface TableProvider