add methed to transform row to vector format to compute

src/gausskernel/runtime/executor/execScan.cpp

@@ -23,6 +23,8 @@
 #include "executor/executor.h"
 #include "miscadmin.h"
 #include "utils/memutils.h"
+#include "vecexecutor/vecexecutor.h"
+#include "vecexecutor/vecnoderowtovector.h"
 
 /*
  * ExecScanFetch -- fetch next potential tuple
@@ -379,3 +381,45 @@ void ExecScanReScan(ScanState* node)
         estate->es_epqScanDone[scan_rel_id - 1] = false;
     }
 }
+
+VectorBatch* ExecBatchScan(ScanState* node, ExecScanAccessMtd access_mtd,
+    ExecScanRecheckMtd recheck_mtd)
+{
+    VectorBatch* p_out_batch = node->m_pCurrentBatch;
+
+    ExprContext* econtext = node->ps.ps_ExprContext;
+    TupleTableSlot* result_slot = NULL;
+
+    ResetExprContext(econtext);
+    /*
+     * We don't go through the regular ExecScan interface as we will handle all
+     * common code ourselves here
+     */
+    p_out_batch->Reset(true);
+
+    if (node->is_scan_end) {
+        return p_out_batch;
+    }
+
+    for (;;) {
+        result_slot = ExecScan(node, access_mtd, recheck_mtd);
+        if (TupIsNull(result_slot)) {
+            node->is_scan_end = true;
+            break;
+        }
+        
+        if (VectorizeOneTuple(p_out_batch, result_slot, econtext->ecxt_per_tuple_memory)) {
+            /* It is full now, now return current batch */
+            break;
+        }
+    }
+
+    p_out_batch->FixRowCount();
+
+    /* Response to the stop query flag. */
+    if (unlikely(executorEarlyStop()))
+        return NULL;
+
+    return p_out_batch;
+}
+