remove pgxcpath.c and RemoteQueryPath, which are both unused

The pgxcpath.c file was not even built, so it's obviously dead code.
As it was the only place referencing RemoteQueryPath, remove that
structure too.

2 files changed, 0 insertions, 158 deletions

diff --git a/src/backend/optimizer/path/pgxcpath.c b/src/backend/optimizer/path/pgxcpath.c
deleted file mode 100644
index 7323830a8e..0000000000
--- a/src/backend/optimizer/path/pgxcpath.c
+++ /dev/null
@@ -1,114 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * pgxcpath.c
- *	  Routines to find possible remote query paths for various relation types.
- *
- * Portions Copyright (c) 2012 Postgres-XC Development Group
- *
- * IDENTIFICATION
- *	  src/backend/optimizer/path/pgxcpath.c
- *
- *-------------------------------------------------------------------------
- */
-#include "postgres.h"
-#include "commands/tablecmds.h"
-#include "optimizer/cost.h"
-#include "optimizer/paths.h"
-#include "optimizer/pathnode.h"
-#include "optimizer/pgxcship.h"
-#include "optimizer/restrictinfo.h"
-#include "parser/parsetree.h"
-#include "pgxc/pgxc.h"
-#include "optimizer/pgxcplan.h"
-
-static RemoteQueryPath *create_remotequery_path(PlannerInfo *root, RelOptInfo *rel,
-								ExecNodes *exec_nodes, RemoteQueryPath *leftpath,
-								RemoteQueryPath *rightpath, JoinType jointype,
-								List *join_restrictlist);
-/*
- * create_remotequery_path
- *	  Creates a RemoteQuery path for a given RelOptInfo.
- *
- * The path buils the RelOptInfo data by querying datanode(s). For RelOptInfo
- * representing a JOIN, the left/right paths represent the RemoteQuery paths
- * for left and right relations, the jointype identifies the type of JOIN, and
- * join_restrictlist contains the restrictinfo list for the JOIN.
- *
- * For a base relation, these parameters should be NULL.
- *
- * ExecNodes is the set of datanodes to which the query should be sent to.
- *
- * This function also marks the path with shippability of the quals.
- *
- * If any of the relations involved in this path is a temporary relation,
- * record that fact.
- */
-static RemoteQueryPath *
-create_remotequery_path(PlannerInfo *root, RelOptInfo *rel, ExecNodes *exec_nodes,
-						RemoteQueryPath *leftpath, RemoteQueryPath *rightpath,
-						JoinType jointype, List *join_restrictlist)
-{
-	RemoteQueryPath	*rqpath = makeNode(RemoteQueryPath);
-	bool			unshippable_quals;
-
-	if (rel->reloptkind == RELOPT_JOINREL && (!leftpath || !rightpath))
-		elog(ERROR, "a join rel requires both the left path and right path");
-
-	rqpath->path.pathtype = T_RemoteQuery;
-	rqpath->path.parent = rel;
-	/* PGXC_TODO: do we want to care about it */
-	rqpath->path.param_info = NULL;
-	rqpath->path.pathkeys = NIL;	/* result is always unsorted */
-	rqpath->rqpath_en = exec_nodes;
-	rqpath->leftpath = leftpath;
-	rqpath->rightpath = rightpath;
-	rqpath->jointype = jointype;
-	rqpath->join_restrictlist = join_restrictlist;
-
-	switch (rel->reloptkind)
-	{
-		case RELOPT_BASEREL:
-
-			/*
-			 * For baserels, the left/right path and restrictlist should be NULL.
-			 *
-			 * XXX I'm not sure if the same is true for other non-join rels, so
-			 * let's only add it for the RELOPT_BASEREL case.
-			 */
-			Assert(leftpath == NULL && rightpath == NULL && join_restrictlist == NIL);
-
-			/* fall-through */
-
-		case RELOPT_OTHER_MEMBER_REL:
-		{
-			RangeTblEntry *rte = rt_fetch(rel->relid, root->parse->rtable);
-			if (rte->rtekind != RTE_RELATION)
-				elog(ERROR, "can not create remote path for ranges of type %d",
-							rte->rtekind);
-			rqpath->has_temp_rel = IsTempTable(rte->relid);
-			unshippable_quals = !pgxc_is_expr_shippable((Expr *)extract_actual_clauses(rel->baserestrictinfo, false),
-														NULL);
-		}
-		break;
-
-		case RELOPT_JOINREL:
-		{
-			rqpath->has_temp_rel = leftpath->has_temp_rel ||
-									rightpath->has_temp_rel;
-			unshippable_quals = !pgxc_is_expr_shippable((Expr *)extract_actual_clauses(join_restrictlist, false),
-														NULL);
-		}
-		break;
-
-		default:
-			elog(ERROR, "can not create remote path for relation of type %d",
-							rel->reloptkind);
-	}
-
-	rqpath->has_unshippable_qual = unshippable_quals;
-
-	/* PGXCTODO - set cost properly */
-	cost_remotequery(rqpath, root, rel);
-
-	return rqpath;
-}
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h
index c0bd1a7bc8..d78197e8a7 100644
--- a/src/include/nodes/relation.h
+++ b/src/include/nodes/relation.h
@@ -1318,50 +1318,6 @@ typedef struct HashPath
 	int			num_batches;	/* number of batches expected */
 } HashPath;
 
-#ifdef PGXC
-/*
- * A remotequery path represents the queries to be sent to the datanode/s
- *
- * When RemoteQuery plan is created from RemoteQueryPath, we build the query to
- * be executed at the datanode. For building such a query, it's important to get
- * the RHS relation and LHS relation of the JOIN clause. So, instead of storing
- * the outer and inner paths, we find out the RHS and LHS paths and store those
- * here.
- */
-
-typedef struct RemoteQueryPath
-{
-	Path			path;
-	ExecNodes		*rqpath_en;		/* List of datanodes to execute the query on */
-
-	/*
-	 * If the path represents a JOIN rel, leftpath and rightpath represent the
-	 * RemoteQuery paths for left (outer) and right (inner) side of the JOIN
-	 * resp. jointype and join_restrictlist pertains to such JOINs. 
-	 */
-	struct RemoteQueryPath	*leftpath;
-	struct RemoteQueryPath	*rightpath;
-	JoinType				jointype;
-	List					*join_restrictlist;	/* restrict list corresponding to JOINs,
-												 * only considered if rest of
-												 * the JOIN information is
-												 * available
-												 */
-	bool					has_unshippable_qual;	/* TRUE if there is at least
-													 * one qual which can not be
-													 * shipped to the datanodes
-													 */
-	bool					has_temp_rel;			/* TRUE if one of the base relations
-													 * involved in this path is a temporary
-													 * table.
-													 */
-	bool					has_unshippable_tlist;	/* TRUE if there is at least one
-													 * targetlist entry which is
-													 * not completely shippable.
-													 */
-} RemoteQueryPath;
-#endif /* PGXC */
-
 /*
  * ProjectionPath represents a projection (that is, targetlist computation)
  *