[WIP] Implement LET clause similar to OrientDB - #2535

[WIP] Implement LET clause similar to OrientDB#2535

mathiasrw with Copilot wants to merge 3 commits into

developAlaSQL/alasql:developfrom

copilot/implement-let-clauseAlaSQL/alasql:copilot/implement-let-clauseCopy head branch name to clipboard