Function IsCurrentScanDocumentVar

pg_documentdb/src/opclass/index_support.c:1525–1540

Returns true if var is the document column of the relation this scan path is for. */

/* Returns true if var is the document column of the relation this scan path is for. */
static bool
IsCurrentScanDocumentVar(Var *var, PlannerInfo *root, Index scanRti)
{
	/* Requires a local BSON Var from the same query source as the scan path,
	 * then confirm that source is a real relation (not a CTE or subquery).
	 */
	if (var->varlevelsup != 0 ||
		var->varno != (int) scanRti ||
		var->varattno != DOCUMENT_DATA_TABLE_DOCUMENT_VAR_ATTR_NUMBER ||
		(var->vartype != BsonTypeId() && var->vartype != DocumentDBCoreBsonTypeId()))
	{
		return false;
	}

	return planner_rt_fetch(var->varno, root)->rtekind == RTE_RELATION;
}


static bool