[CALCITE-529] Allow to pass java object via rexBuilder.makeLiteral()

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.0.0-incubating
• Labels: newbie
• Assignee: Unassigned
• Reporter: Vladimir Sitnikov
• Created: 13/Dec/14 11:40
• Updated: 22/Feb/19 01:22

Description

Motivation: Rex is simpler that linq4j.

For instance,
1) Sometimes it is easier to create a ProjectRel rather than lower the expression to low-level linq4j
2) XXXToEnumerableRule are easier to accomplish via TableFunctionScan. This allows to express the call via Rex and skip linq4j completely.

For example: https://github.com/vlsi/mat-calcite-plugin/blob/master/MatCalcitePlugin/src/com/github/vlsi/mat/optiq/rules/InstanceAccessByClassIdRule.java#L43

The problem is to pass non-literal java object to enumerable/interpreter conventions.

For enumerable the implementation can use stash. For interpreter it can use the value as is, etc.

Issue Links

• is related to: CALCITE-98 API to pass application-specific data through DataContext
• is related to: CALCITE-506 Update EnumerableRelImplementor.stash so it is suitable for all kinds of classes