Package org.apache.calcite.example.maze

Class MazeTable

java.lang.Object

org.apache.calcite.schema.impl.AbstractTable

org.apache.calcite.example.maze.MazeTable

All Implemented Interfaces:

ScannableTable, Table, Wrapper

public class MazeTable
extends AbstractTable
implements ScannableTable

User-defined table function that generates a Maze and prints it in text form.

Method Summary

Modifier and Type	Method	Description
static ScannableTable	generate(int width, int height, int seed)	Table function that generates a maze.
RelDataType	getRowType(RelDataTypeFactory typeFactory)	Returns this table's row type.
Enumerable<@Nullable Object[]>	scan(DataContext root)	Returns an enumerator over the rows in this Table.
static ScannableTable	solve(int width, int height, int seed)	Table function that generates a maze with a solution.

Methods inherited from class org.apache.calcite.schema.impl.AbstractTable

getJdbcTableType, getStatistic, isRolledUp, rolledUpColumnValidInsideAgg, unwrap

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.schema.Table

getJdbcTableType, getStatistic, isRolledUp, rolledUpColumnValidInsideAgg

Methods inherited from interface org.apache.calcite.schema.Wrapper

maybeUnwrap, unwrapOrThrow

Method Details

generate

public static ScannableTable generate(int width,
 int height,
 int seed)

Table function that generates a maze.

Called by reflection based on the definition of the user-defined function in the schema.

Parameters:

width - Width of maze

height - Height of maze

seed - Random number seed, or -1 to create an unseeded random

Returns:

Table that prints the maze in text form

solve

public static ScannableTable solve(int width,
 int height,
 int seed)

Table function that generates a maze with a solution.

Called by reflection based on the definition of the user-defined function in the schema.

Parameters:

width - Width of maze

height - Height of maze

seed - Random number seed, or -1 to create an unseeded random

Returns:

Table that prints the maze in text form, with solution shown

getRowType

public RelDataType getRowType(RelDataTypeFactory typeFactory)

Description copied from interface: Table

Returns this table's row type.

This is a struct type whose fields describe the names and types of the columns in this table.

The implementer must use the type factory provided. This ensures that the type is converted into a canonical form; other equal types in the same query will use the same object.

Specified by:

getRowType in interface Table

Parameters:

typeFactory - Type factory with which to create the type

Returns:

Row type

scan

public Enumerable<@Nullable Object[]> scan(DataContext root)

Description copied from interface: ScannableTable

Returns an enumerator over the rows in this Table. Each row is represented as an array of its column values.

Specified by:

scan in interface ScannableTable