Refactor SeqNext() for more efficient and readable.

Author: zhangyue-hashdata

src/backend/executor/nodeSeqscan.c

@@ -101,14 +101,22 @@ SeqNext(SeqScanState *node)
 	/*
 	 * get the next tuple from the table
 	 */
-	while (table_scan_getnextslot(scandesc, direction, slot))
+	if (node->filter_in_seqscan && node->filters)
 	{
-		if (node->filter_in_seqscan && node->filters &&
-			!PassByBloomFilter(node, slot))
-			continue;
+		while (table_scan_getnextslot(scandesc, direction, slot))
+		{
+			if (!PassByBloomFilter(node, slot))
+				continue;
 
-		return slot;
+			return slot;
+		}
 	}
+	else
+	{
+		if (table_scan_getnextslot(scandesc, direction, slot))
+			return slot;
+	}
+
 	return NULL;
 }