org.apache.flink.table.planner.operations.converters

Interface SqlNodeConverter<S extends org.apache.calcite.sql.SqlNode>

All Known Implementing Classes:

SqlAlterTableAddPartitionConverter, SqlAlterTableDropPartitionConverter, SqlAlterViewAsConverter, SqlAlterViewPropertiesConverter, SqlAlterViewRenameConverter, SqlCreateCatalogConverter, SqlCreateViewConverter, SqlProcedureCallConverter, SqlQueryConverter, SqlReplaceTableAsConverter, SqlShowDatabasesConverter, SqlShowFunctionsConverter, SqlShowPartitionsConverter, SqlShowProcedureConverter, SqlTruncateTableConverter

public interface SqlNodeConverter<S extends org.apache.calcite.sql.SqlNode>

A converter to convert SqlNode instance into Operation.

By default, a SqlNodeConverter only matches a specific SqlNode class to convert which is defined by the parameter type S. But a SqlNodeConverter can also match a set of SqlNodes with the SqlKind if it defines the supportedSqlKinds().

See Also:

SqlNodeConverters

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	SqlNodeConverter.ConvertContext Context of SqlNodeConverter.

Method Summary

Modifier and Type	Method and Description
org.apache.flink.table.operations.Operation	convertSqlNode(S node, SqlNodeConverter.ConvertContext context) Convert the given validated SqlNode into an Operation.
default Optional<EnumSet<org.apache.calcite.sql.SqlKind>>	supportedSqlKinds() Returns the SqlKinds of SqlNodes that the SqlNodeConverter supports to convert.

Method Detail

convertSqlNode

org.apache.flink.table.operations.Operation convertSqlNode(S node,
                                                           SqlNodeConverter.ConvertContext context)

Convert the given validated SqlNode into an Operation.

Parameters:

node - a validated SqlNode.

context - the utilities and context information to convert

supportedSqlKinds

default Optional<EnumSet<org.apache.calcite.sql.SqlKind>> supportedSqlKinds()

Returns the SqlKinds of SqlNodes that the SqlNodeConverter supports to convert.

If a SqlNodeConverter returns a non-empty SqlKinds, The conversion framework will find the corresponding converter by matching the SqlKind of SqlNode instead of the class of SqlNode

See Also:

SqlQueryConverter