RelColumnOrigin (Apache Calcite API)

java.lang.Object
- org.apache.calcite.rel.metadata.RelColumnOrigin

```
public class RelColumnOrigin
extends java.lang.Object
```
RelColumnOrigin is a data structure describing one of the origins of an output column produced by a relational expression.

Field Summary

Fields
Modifier and Type Field Description

private int iOriginColumn

private boolean isDerived

private RelOptTable originTable

Constructor Summary

Constructors
Constructor Description

RelColumnOrigin(RelOptTable originTable, int iOriginColumn, boolean isDerived)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(java.lang.Object obj)`
`int`	`getOriginColumnOrdinal()`
`RelOptTable`	`getOriginTable()`
`int`	`hashCode()`
`boolean`	`isDerived()`	Consider the query `select a+b as c, d as e from t`.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - originTable
```
private final RelOptTable originTable
```
  - iOriginColumn
```
private final int iOriginColumn
```
  - isDerived
```
private final boolean isDerived
```
- Constructor Detail
  - RelColumnOrigin
```
public RelColumnOrigin(RelOptTable originTable,
                       int iOriginColumn,
                       boolean isDerived)
```
- Method Detail
  - getOriginTable
```
public RelOptTable getOriginTable()
```
    Returns:
    
    table of origin
  - getOriginColumnOrdinal
```
public int getOriginColumnOrdinal()
```
    Returns:
    
    0-based index of column in origin table; whether this ordinal is flattened or unflattened depends on whether UDT flattening has already been performed on the relational expression which produced this description
  - isDerived
```
public boolean isDerived()
```
    Consider the query select a+b as c, d as e from t. The output column c has two origins (a and b), both of them derived. The output column d as one origin (c), which is not derived.
    
    Returns:
    
    false if value taken directly from column in origin table; true otherwise
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Overrides:
    
    equals in class java.lang.Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class java.lang.Object