ListRelation Join

rascal-0.40.17

Synopsis

Join two list relation values.

Syntax

Exp₁ join Exp₂

Types

//

Exp₁	Exp₂	Exp₁ join Exp₂
lrel[ T₁₁, T₁₂, T₁₃, ... ]	lrel[ T₂₁, T₂₂, T₂₃, ... ]	lrel[ T₁₁, T₁₂, T₁₃, ..., T₂₁, T₂₂, T₂₃, ... ]

Description

ListRelation resulting from the natural join of the list relation values of the two arguments. This list relation contains tuples that are the result from concatenating the elements from both arguments.

Examples

rascal>[<1,2>, <10,20>] join [<2,3>];
lrel[int,int,int,int]: [
  <1,2,2,3>,
  <10,20,2,3>
]
rascal>[<1,2>] join [3, 4];
lrel[int,int,int]: [
  <1,2,3>,
  <1,2,4>
]
rascal>[<1,2>, <10,20>] join [<2,3>, <20,30>];
lrel[int,int,int,int]: [
  <1,2,2,3>,
  <1,2,20,30>,
  <10,20,2,3>,
  <10,20,20,30>
]