Lattice.Column (Apache Calcite API)

java.lang.Object
- org.apache.calcite.materialize.Lattice.Column

All Implemented Interfaces:

java.lang.Comparable<Lattice.Column>

Direct Known Subclasses:

Lattice.BaseColumn, Lattice.DerivedColumn

Enclosing class:

Lattice
```
public abstract static class Lattice.Column
extends java.lang.Object
implements java.lang.Comparable<Lattice.Column>
```
Column in a lattice. May be an a base column or an expression, and may have an additional alias that is unique within the entire lattice.

Field Summary

Fields
Modifier and Type Field Description

java.lang.String alias
Alias of the column, unique within the lattice.

int ordinal
Ordinal of the column within the lattice.

Constructor Summary

Constructors
Modifier Constructor Description

private Column(int ordinal, java.lang.String alias)

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`compareTo(Lattice.Column column)`
`abstract java.lang.String`	`defaultAlias()`	The alias that SQL would give to this expression.
`boolean`	`equals(java.lang.Object obj)`
`int`	`hashCode()`
`(package private) static ImmutableBitSet`	`toBitSet(java.util.List<Lattice.Column> columns)`	Converts a list of columns to a bit set of their ordinals.
`abstract void`	`toSql(Lattice.SqlWriter writer)`

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

- Field Detail
  - ordinal
```
public final int ordinal
```
    Ordinal of the column within the lattice.
  - alias
```
public final java.lang.String alias
```
    Alias of the column, unique within the lattice. Derived from the column name, automatically disambiguated if necessary.
- Constructor Detail
  - Column
```
private Column(int ordinal,
               java.lang.String alias)
```
- Method Detail
  - toBitSet
```
static ImmutableBitSet toBitSet(java.util.List<Lattice.Column> columns)
```
    Converts a list of columns to a bit set of their ordinals.
  - compareTo
```
public int compareTo(Lattice.Column column)
```
    Specified by:
    
    compareTo in interface java.lang.Comparable<Lattice.Column>
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class java.lang.Object
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Overrides:
    
    equals in class java.lang.Object
  - toSql
```
public abstract void toSql(Lattice.SqlWriter writer)
```
  - defaultAlias
```
public abstract java.lang.String defaultAlias()
```
    The alias that SQL would give to this expression.