org.apache.flink.table.planner.calcite

Class FlinkSqlNameMatcher

java.lang.Object

org.apache.flink.table.planner.calcite.FlinkSqlNameMatcher

All Implemented Interfaces:

org.apache.calcite.sql.validate.SqlNameMatcher

public class FlinkSqlNameMatcher
extends Object
implements org.apache.calcite.sql.validate.SqlNameMatcher

A workaround for adjusting types of ROW nested fields.

The SqlNameMatcher is used in SqlValidatorImpl when deriving a type of a nested field of a Table. E.g SELECT `row`.`nested` FROM table. See field(RelDataType, String) for more information.

Constructor Summary

Constructors

Constructor and Description
FlinkSqlNameMatcher(org.apache.calcite.sql.validate.SqlNameMatcher baseMatcher, org.apache.calcite.rel.type.RelDataTypeFactory typeFactory)

Method Summary

Modifier and Type	Method and Description
String	bestString()
Set<String>	createSet()
org.apache.calcite.rel.type.RelDataTypeField	field(org.apache.calcite.rel.type.RelDataType rowType, String fieldName) Compared to the original method we adjust the nullability of the nested column based on the nullability of the enclosing type.
int	frequency(Iterable<String> names, String name)
<K extends List<String>,V> V	get(Map<K,V> map, List<String> prefixNames, List<String> names)
boolean	isCaseSensitive()
boolean	matches(String string, String name)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.calcite.sql.validate.SqlNameMatcher

indexOf

Constructor Detail

FlinkSqlNameMatcher

public FlinkSqlNameMatcher(org.apache.calcite.sql.validate.SqlNameMatcher baseMatcher,
                           org.apache.calcite.rel.type.RelDataTypeFactory typeFactory)

Method Detail

isCaseSensitive

public boolean isCaseSensitive()

Specified by:

isCaseSensitive in interface org.apache.calcite.sql.validate.SqlNameMatcher

matches

public boolean matches(String string,
                       String name)

Specified by:

matches in interface org.apache.calcite.sql.validate.SqlNameMatcher

get

public <K extends List<String>,V> V get(Map<K,V> map,
                                        List<String> prefixNames,
                                        List<String> names)

Specified by:

get in interface org.apache.calcite.sql.validate.SqlNameMatcher

bestString

public String bestString()

Specified by:

bestString in interface org.apache.calcite.sql.validate.SqlNameMatcher

field

public org.apache.calcite.rel.type.RelDataTypeField field(org.apache.calcite.rel.type.RelDataType rowType,
                                                          String fieldName)

Compared to the original method we adjust the nullability of the nested column based on the nullability of the enclosing type.

If the fields type is NOT NULL, but the enclosing ROW is nullable we still can produce nulls.

Specified by:

field in interface org.apache.calcite.sql.validate.SqlNameMatcher

frequency

public int frequency(Iterable<String> names,
                     String name)

Specified by:

frequency in interface org.apache.calcite.sql.validate.SqlNameMatcher

createSet

public Set<String> createSet()

Specified by:

createSet in interface org.apache.calcite.sql.validate.SqlNameMatcher