[CALCITE-2127] In Interpreter, allow a node to have more than one consumer

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.16.0
• Assignee: Julian Hyde
• Reporter: Julian Hyde
• Created: 10/Jan/18 06:56
• Updated: 27/Feb/24 22:23
• Resolved: 10/Jan/18 19:53

Description

In Interpreter, allow a node to have more than one consumer. In other words, the graph may be a DAG not just a tree.

If a node has more than one consumer, its Sink is a DuplicatingSink that writes to multiple consumers. Each has an independent ArrayDeque.

This change will only be exercised when CALCITE-2116 is fixed, and the planner starts producing DAG plans.

Issue Links

• is related to: CALCITE-481 Add "Spool" operator, to allow re-use of relational expressions