org.apache.flink.table.delegation

Interface Parser

All Known Implementing Classes:

ParserImpl, ParserImpl

@Internal
public interface Parser

Provides methods for parsing SQL objects from a SQL string.

Method Summary

Modifier and Type	Method and Description
List<Operation>	parse(String statement) Entry point for parsing SQL queries expressed as a String.
UnresolvedIdentifier	parseIdentifier(String identifier) Entry point for parsing SQL identifiers expressed as a String.
ResolvedExpression	parseSqlExpression(String sqlExpression, TableSchema inputSchema) Entry point for parsing SQL expressions expressed as a String.

Method Detail

parse

List<Operation> parse(String statement)

Entry point for parsing SQL queries expressed as a String.

Note:If the created Operation is a QueryOperation it must be in a form that will be understood by the Planner.translate(List) method.

The produced Operation trees should already be validated.

Parameters:

statement - the SQL statement to evaluate

Returns:

parsed queries as trees of relational Operations

Throws:

SqlParserException - when failed to parse the statement

parseIdentifier

UnresolvedIdentifier parseIdentifier(String identifier)

Entry point for parsing SQL identifiers expressed as a String.

Parameters:

identifier - the SQL identifier to parse

Returns:

parsed identifier

Throws:

SqlParserException - when failed to parse the identifier

parseSqlExpression

ResolvedExpression parseSqlExpression(String sqlExpression,
                                      TableSchema inputSchema)

Entry point for parsing SQL expressions expressed as a String.

Parameters:

sqlExpression - the SQL expression to parse

inputSchema - the schema of the fields in sql expression

Returns:

resolved expression

Throws:

SqlParserException - when failed to parse the sql expression