Align scan terminology: Shared Scan and ShareInputScan.

The plan node appears as 'Shared Scan' in user's EXPLAIN output,
while internally it's represented as ShareInputScan type.

Most codes use the correct terms, but some places incorrectly
mix:
- 'shared input scan' in codebase (should be 'ShareInputScan')
- 'Share Scan' in EXPLAIN (should be 'Shared Scan')

This change aligns all usage while preserving existing correct
references.

Authored-by: Zhang Mingli avamingli@gmail.com

Author: avamingli

contrib/pax_storage/src/test/regress/expected/qp_with_clause.out

@@ -11089,7 +11089,7 @@ ORDER BY 1, 2, 3, 4 DESC LIMIT 25;
  35NAME        |              7 | 5NAME        |              1
 (25 rows)
 
--- Test that SharedInputScan within the same slice is always executed 
+-- Test that ShareInputScan within the same slice is always executed 
 set gp_cte_sharing=on;
 -- start_ignore
 CREATE TABLE car (a int, b int);

contrib/pax_storage/src/test/regress/expected/query_finish_pending.out

@@ -92,7 +92,7 @@ select gp_inject_fault('execsort_sort_bounded_heap', 'status', 2);
 
 (1 row)
 
--- test if shared input scan deletes memory correctly when QueryFinishPending and its child has been eagerly freed,
+-- test if Share Input Scan deletes memory correctly when QueryFinishPending and its child has been eagerly freed,
 -- where the child is a Sort node
 drop table if exists testsisc;
 NOTICE:  table "testsisc" does not exist, skipping
@@ -104,7 +104,7 @@ insert into testsisc select i, i % 1000, i % 100000, i % 75 from
 	(select count(*) as nsegments from gp_segment_configuration where role='p' and content >= 0) foo) bar; 
 set gp_resqueue_print_operator_memory_limits=on;
 set statement_mem='2MB';
--- ORCA does not generate SharedInputScan with a Sort node underneath it. For
+-- ORCA does not generate ShareInputScan with a Sort node underneath it. For
 -- the following query, ORCA disregards the order by inside the cte definition;
 -- planner on the other hand does not.
 set optimizer=off;
@@ -114,8 +114,8 @@ select gp_inject_fault('execshare_input_next', 'reset', 2);
  Success:
 (1 row)
 
--- Set QueryFinishPending to true after SharedInputScan has retrieved the first tuple. 
--- This will eagerly free the memory context of shared input scan's child node.  
+-- Set QueryFinishPending to true after ShareInputScan has retrieved the first tuple. 
+-- This will eagerly free the memory context of Share Input Scan's child node.  
 select gp_inject_fault('execshare_input_next', 'finish_pending', 2);
  gp_inject_fault 
 -----------------
@@ -137,16 +137,16 @@ select gp_inject_fault('execshare_input_next', 'status', 2);
 
 (1 row)
 
--- test if shared input scan deletes memory correctly when QueryFinishPending and its child has been eagerly freed,
+-- test if Share Input Scan deletes memory correctly when QueryFinishPending and its child has been eagerly freed,
 -- where the child is a Sort node and sort_mk algorithm is used
 select gp_inject_fault('execshare_input_next', 'reset', 2);
  gp_inject_fault 
 -----------------
  Success:
 (1 row)
 
--- Set QueryFinishPending to true after SharedInputScan has retrieved the first tuple. 
--- This will eagerly free the memory context of shared input scan's child node.  
+-- Set QueryFinishPending to true after ShareInputScan has retrieved the first tuple. 
+-- This will eagerly free the memory context of Share Input Scan's child node.  
 select gp_inject_fault('execshare_input_next', 'finish_pending', 2);
  gp_inject_fault 
 -----------------

contrib/pax_storage/src/test/regress/input/temp_tablespaces.source

@@ -45,7 +45,7 @@ CREATE TABLE tts_foo (i int, j int) distributed by(i);
 insert into tts_foo select i, i from generate_series(1,80000)i;
 ANALYZE tts_foo;
 set gp_cte_sharing=on;
--- CBDB_PARALLEL_FIXME: since we disabled shared input scan in parallel mode, sisc_xslice_temp_files
+-- CBDB_PARALLEL_FIXME: since we disabled Share Input Scan in parallel mode, sisc_xslice_temp_files
 -- will never be triggered. We need set max_parallel_workers_per_gather to 0 in this case.
 set max_parallel_workers_per_gather = 0;
 

contrib/pax_storage/src/test/regress/output/temp_tablespaces.source

@@ -56,7 +56,7 @@ CREATE TABLE tts_foo (i int, j int) distributed by(i);
 insert into tts_foo select i, i from generate_series(1,80000)i;
 ANALYZE tts_foo;
 set gp_cte_sharing=on;
--- CBDB_PARALLEL_FIXME: since we disabled shared input scan in parallel mode, sisc_xslice_temp_files
+-- CBDB_PARALLEL_FIXME: since we disabled Share Input Scan in parallel mode, sisc_xslice_temp_files
 -- will never be triggered. We need set max_parallel_workers_per_gather to 0 in this case.
 set max_parallel_workers_per_gather = 0;
 -- CASE 1: when temp_tablespaces is set, hashagg and share-input-scan

contrib/pax_storage/src/test/regress/sql/qp_with_clause.sql

@@ -10329,7 +10329,7 @@ WHERE  e.deptno = dc1.deptno AND
        m.deptno = dmc1.dept_mgr_no
 ORDER BY 1, 2, 3, 4 DESC LIMIT 25;
 
--- Test that SharedInputScan within the same slice is always executed 
+-- Test that ShareInputScan within the same slice is always executed 
 set gp_cte_sharing=on;
 
 -- start_ignore

contrib/pax_storage/src/test/regress/sql/query_finish_pending.sql

@@ -38,7 +38,7 @@ reset enable_parallel;
 
 select gp_inject_fault('execsort_sort_bounded_heap', 'status', 2);
 
--- test if shared input scan deletes memory correctly when QueryFinishPending and its child has been eagerly freed,
+-- test if Share Input Scan deletes memory correctly when QueryFinishPending and its child has been eagerly freed,
 -- where the child is a Sort node
 drop table if exists testsisc;
 create table testsisc (i1 int, i2 int, i3 int, i4 int); 
@@ -48,13 +48,13 @@ insert into testsisc select i, i % 1000, i % 100000, i % 75 from
 
 set gp_resqueue_print_operator_memory_limits=on;
 set statement_mem='2MB';
--- ORCA does not generate SharedInputScan with a Sort node underneath it. For
+-- ORCA does not generate ShareInputScan with a Sort node underneath it. For
 -- the following query, ORCA disregards the order by inside the cte definition;
 -- planner on the other hand does not.
 set optimizer=off;
 select gp_inject_fault('execshare_input_next', 'reset', 2);
--- Set QueryFinishPending to true after SharedInputScan has retrieved the first tuple. 
--- This will eagerly free the memory context of shared input scan's child node.  
+-- Set QueryFinishPending to true after ShareInputScan has retrieved the first tuple. 
+-- This will eagerly free the memory context of Share Input Scan's child node.  
 select gp_inject_fault('execshare_input_next', 'finish_pending', 2);
 
 set enable_parallel = off;
@@ -64,13 +64,13 @@ select * from cte c1, cte c2 limit 2;
 
 select gp_inject_fault('execshare_input_next', 'status', 2);
 
--- test if shared input scan deletes memory correctly when QueryFinishPending and its child has been eagerly freed,
+-- test if Share Input Scan deletes memory correctly when QueryFinishPending and its child has been eagerly freed,
 -- where the child is a Sort node and sort_mk algorithm is used
 
 
 select gp_inject_fault('execshare_input_next', 'reset', 2);
--- Set QueryFinishPending to true after SharedInputScan has retrieved the first tuple. 
--- This will eagerly free the memory context of shared input scan's child node.  
+-- Set QueryFinishPending to true after ShareInputScan has retrieved the first tuple. 
+-- This will eagerly free the memory context of Share Input Scan's child node.  
 select gp_inject_fault('execshare_input_next', 'finish_pending', 2);
 
 with cte as (select i2 from testsisc order by i2)

src/backend/cdb/cdbmutate.c

@@ -825,8 +825,8 @@ shareinput_peekmot(ApplyShareInputContext *ctxt)
  * plan.
  *
  * To work around that issue, create a CTE for each shared input node, with
- * columns that match the target list of the SharedInputScan's subplan,
- * and replace the target list entries of the SharedInputScan with
+ * columns that match the target list of the ShareInputScan's subplan,
+ * and replace the target list entries of the ShareInputScan with
  * Vars that point to the CTE instead of the child plan.
  */
 Plan *
@@ -893,8 +893,8 @@ replace_shareinput_targetlists_walker(Node *node, PlannerInfo *root, bool fPop)
 		/*
 		 * Replace all the target list entries.
 		 *
-		 * SharedInputScan nodes are not projection-capable, so the target
-		 * list of the SharedInputScan matches the subplan's target list.
+		 * ShareInputScan nodes are not projection-capable, so the target
+		 * list of the ShareInputScan matches the subplan's target list.
 		 */
 		newtargetlist = NIL;
 		attno = 1;

src/backend/executor/nodeShareInputScan.c

@@ -76,7 +76,7 @@
 /*
  * In a cross-slice ShareinputScan, the producer and consumer processes
  * communicate using shared memory. There's a hash table containing one
- * 'shareinput_share_state' for each in-progress shared input scan.
+ * 'shareinput_share_state' for each in-progress Share Input Scan.
  *
  * The hash table itself,, and the fields within every entry, are protected
  * by ShareInputScanLock. (Although some operations get away without the
@@ -631,11 +631,11 @@ ExecSquelchShareInputScan(ShareInputScanState *node, bool force)
 	ExecClearTuple(node->ss.ps.ps_ResultTupleSlot);
 
 	/*
-	 * If this SharedInputScan is shared within the same slice then its
+	 * If this ShareInputScan is shared within the same slice then its
 	 * subtree may still need to be executed and the motions in the subtree
 	 * cannot yet be stopped. Thus, don't recurse in this case.
 	 *
-	 * In squelching a cross-slice SharedInputScan writer, we need to ensure
+	 * In squelching a cross-slice ShareInputScan writer, we need to ensure
 	 * we don't block any reader on other slices as a result of not
 	 * materializing the shared plan.
 	 *

src/backend/gpopt/translate/CTranslatorDXLToPlStmt.cpp

@@ -4445,7 +4445,7 @@ CTranslatorDXLToPlStmt::TranslateDXLCTEProducerToSharedScan(
 		CDXLPhysicalCTEProducer::Cast(cte_producer_dxlnode->GetOperator());
 	ULONG cte_id = cte_prod_dxlop->Id();
 
-	// create the shared input scan representing the CTE Producer
+	// create the Share Input Scan representing the CTE Producer
 	ShareInputScan *shared_input_scan = MakeNode(ShareInputScan);
 	shared_input_scan->share_id = cte_id;
 	shared_input_scan->discard_output = true;

src/backend/gporca/libgpopt/src/translate/CTranslatorDXLToExpr.cpp

@@ -367,7 +367,7 @@ void CTranslatorDXLToExpr::PruneCTEs()
 			poper->RecalOutputColumns(umask, pprgpcrsz);
 
 			// Align consumer and producer output columns.
-			// In fact, we can support the column projection in consumer(SharedInputScan).
+			// In fact, we can support the column projection in consumer(ShareInputScan).
 			// However, non-requested columns in consumer(which from producer) may be added to the consumer, 
 			// which will make the plan for consumer(support projection) very complicated. 
 			//