【标题】：修复yat执行shrink相关语句报错的问题.

（cherry picked commit from <gitee.com//opengauss/openGauss-server/commit/41436335c8bbd805768a2a3426f169e8dc401ff9>

src/common/backend/nodes/copyfuncs.cpp

@@ -7815,6 +7815,14 @@ static CharsetClause *_copyCharsetClause(const CharsetClause* from)
     return newnode;
 }
 
+static ShrinkStmt *_copyShrinkStmt(const ShrinkStmt* from)
+{
+    ShrinkStmt* newnode = makeNode(ShrinkStmt);
+    COPY_NODE_FIELD(relations);
+    COPY_SCALAR_FIELD(nowait);
+    return newnode;
+}
+
 static PrefixKey* _copyPrefixKey(const PrefixKey* from)
 {
     PrefixKey* newnode = makeNode(PrefixKey);
@@ -9286,6 +9294,9 @@ void* copyObject(const void* from)
         case T_CharsetClause:
             retval = _copyCharsetClause((CharsetClause *)from);
             break;
+        case T_ShrinkStmt:
+            retval = _copyShrinkStmt((ShrinkStmt*) from);
+            break;
 #ifdef USE_SPQ
         case T_Motion:
             retval = _copyMotion((Motion*)from);

src/common/backend/nodes/equalfuncs.cpp

@@ -3627,6 +3627,14 @@ static bool _equalCharsetClause(const CharsetClause* a, const CharsetClause* b)
     return true;
 }
 
+
+static bool _equalShrinkStmt(const ShrinkStmt* a, const ShrinkStmt* b)
+{
+    COMPARE_NODE_FIELD(relations);
+    COMPARE_SCALAR_FIELD(nowait);
+    return true;
+}
+
 static bool _equalPrefixKey(const PrefixKey* a, const PrefixKey* b)
 {
     COMPARE_NODE_FIELD(arg);
@@ -4636,6 +4644,9 @@ bool equal(const void* a, const void* b)
         case T_CharsetClause:
             retval = _equalCharsetClause((const CharsetClause*) a, (const CharsetClause*) b);
             break;
+        case T_ShrinkStmt:
+            retval = _equalShrinkStmt((const ShrinkStmt*)a, (const ShrinkStmt*)b);
+            break;
         case T_PrefixKey:
             retval = _equalPrefixKey((PrefixKey *)a, (PrefixKey *)b);
             break;

src/common/backend/nodes/outfuncs.cpp

@@ -6384,6 +6384,14 @@ static void _outCharsetClause(StringInfo str, CharsetClause* node)
     WRITE_LOCATION_FIELD(location);
 }
 
+static void _outShrinkStmt(StringInfo str, ShrinkStmt* node)
+{
+    WRITE_NODE_TYPE("SHRINK");
+    WRITE_NODE_FIELD(relations);
+    WRITE_BOOL_FIELD(nowait);
+}
+
+
 static void _outPrefixKey(StringInfo str, PrefixKey* node)
 {
     WRITE_NODE_TYPE("PREFIXKEY");
@@ -7375,6 +7383,9 @@ static void _outNode(StringInfo str, const void* obj)
             case T_CharsetClause:
                 _outCharsetClause(str, (CharsetClause*)obj);
                 break;
+            case T_ShrinkStmt:
+                _outShrinkStmt(str, (ShrinkStmt*)obj);
+                break;
             case T_AutoIncrement:
                 _outAutoIncrement(str, (AutoIncrement*)obj);
                 break;

src/common/backend/nodes/readfuncs.cpp

@@ -6471,6 +6471,16 @@ static CharsetClause* _readCharsetClause()
     READ_DONE();
 }
 
+static ShrinkStmt* _readShrinkStmt()
+{
+    READ_LOCALS(ShrinkStmt);
+
+    READ_NODE_FIELD(relations);
+    READ_BOOL_FIELD(nowait);
+
+    READ_DONE();
+}
+
 static PrefixKey* _readPrefixKey()
 {
     READ_LOCALS(PrefixKey);
@@ -7089,7 +7099,9 @@ Node* parseNodeString(void)
         return_value = _readRotateClause();
     } else if (MATCH("UNROTATEINFO", 12)) {
         return_value = _readUnrotateClause();
-    }  else {
+    } else if (MATCH("SHRINK", 6)) {
+        return_value = _readShrinkStmt();
+    } else {
         ereport(ERROR,
             (errcode(ERRCODE_UNRECOGNIZED_NODE_TYPE),
                 errmsg("parseNodeString(): badly formatted node string \"%s\"...", token)));