Projection (Sparqlify SPARQL->SQL rewriter

Constructors
Constructor and Description
`Projection()`
`Projection(List<String> names, Map<String,SqlExpr> nameToExpr)`
`Projection(Map<String,SqlExpr> nameToExpr)`

Methods
Modifier and Type	Method and Description
`void`	`add(Projection other)`
`void`	`extend(Projection other)`
`List<String>`	`getNames()`
`Map<String,SqlExpr>`	`getNameToExpr()`
`Map<String,TypeToken>`	`getTypeMap()`
`boolean`	`isEmpty()`
`void`	`project(List<String> columnNames)` In place projection
`void`	`put(String name, SqlExpr expr)`
`void`	`rename(String oldName, String newName)` Create a new projection with only the given column names retained
`void`	`renameAll(Map<String,String> oldToNew)` In place rename
`String`	`toString()`

public Projection(Map<String,SqlExpr> nameToExpr)

public Projection(List<String> names,
          Map<String,SqlExpr> nameToExpr)

public Map<String,TypeToken> getTypeMap()

public void renameAll(Map<String,String> oldToNew)

In place rename

public void put(String name,
       SqlExpr expr)

public Map<String,SqlExpr> getNameToExpr()

Class Projection