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未验证 提交 69d19681 编写于 作者: X xiao-yu-wang 提交者： GitHub
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Merge pull request #10160 from taosdata/feature/3.0_wxy 

TD-13338 SELECT statement translate code
上级 0587571e f6c1218b
展开全部 隐藏空白更改
内联 并排
Showing with 263 addition and 87 deletion
include/nodes/nodes.h
浏览文件 @ 69d19681
......@@ -55,7 +55,7 @@ typedef enum ENodeType {
QUERY_NODE_FILL,
// only for parser
QUERY_NODE_TARGET_EXPR,
QUERY_NODE_RAW_EXPR,
QUERY_NODE_SET_OPERATOR,
QUERY_NODE_SELECT_STMT,
......@@ -81,6 +81,13 @@ typedef struct SNodeList {
SListCell* pTail;
} SNodeList;
typedef struct SRawExprNode {
ENodeType nodeType;
char* p;
uint32_t n;
SNode* pNode;
} SRawExprNode;
typedef struct SDataType {
uint8_t type;
uint8_t precision;
......
source/libs/parser/inc/astCreateFuncs.h
浏览文件 @ 69d19681
......@@ -27,12 +27,10 @@ extern "C" {
extern SToken nil_token;
typedef struct STargetExprNode {
ENodeType nodeType;
char* p;
uint32_t n;
SNode* pNode;
} STargetExprNode;
SNode* createRawExprNode(SAstCreateContext* pCxt, const SToken* pToken, SNode* pNode);
SNode* createRawExprNodeExt(SAstCreateContext* pCxt, const SToken* pStart, const SToken* pEnd, SNode* pNode);
SNode* releaseRawExprNode(SAstCreateContext* pCxt, SNode* pNode);
SToken getTokenFromRawExprNode(SAstCreateContext* pCxt, SNode* pNode);
SNodeList* createNodeList(SAstCreateContext* pCxt, SNode* pNode);
SNodeList* addNodeToList(SAstCreateContext* pCxt, SNodeList* pList, SNode* pNode);
......
source/libs/parser/inc/new_sql.y
浏览文件 @ 69d19681
......@@ -67,19 +67,19 @@ cmd ::= SHOW DATABASES.
cmd ::= query_expression(A). { PARSER_TRACE; pCxt->pRootNode = A; }
/************************************************ literal *************************************************************/
literal(A) ::= NK_INTEGER(B). { PARSER_TRACE; A = createValueNode(pCxt, TSDB_DATA_TYPE_BIGINT, &B); }
literal(A) ::= NK_FLOAT(B). { PARSER_TRACE; A = createValueNode(pCxt, TSDB_DATA_TYPE_DOUBLE, &B); }
literal(A) ::= NK_STRING(B). { PARSER_TRACE; A = createValueNode(pCxt, TSDB_DATA_TYPE_BINARY, &B); }
literal(A) ::= NK_BOOL(B). { PARSER_TRACE; A = createValueNode(pCxt, TSDB_DATA_TYPE_BOOL, &B); }
literal(A) ::= TIMESTAMP NK_STRING(B). { PARSER_TRACE; A = createValueNode(pCxt, TSDB_DATA_TYPE_TIMESTAMP, &B); }
literal(A) ::= NK_INTEGER(B). { PARSER_TRACE; A = createRawExprNode(pCxt, &B, createValueNode(pCxt, TSDB_DATA_TYPE_BIGINT, &B)); }
literal(A) ::= NK_FLOAT(B). { PARSER_TRACE; A = createRawExprNode(pCxt, &B, createValueNode(pCxt, TSDB_DATA_TYPE_DOUBLE, &B)); }
literal(A) ::= NK_STRING(B). { PARSER_TRACE; A = createRawExprNode(pCxt, &B, createValueNode(pCxt, TSDB_DATA_TYPE_BINARY, &B)); }
literal(A) ::= NK_BOOL(B). { PARSER_TRACE; A = createRawExprNode(pCxt, &B, createValueNode(pCxt, TSDB_DATA_TYPE_BOOL, &B)); }
literal(A) ::= TIMESTAMP(B) NK_STRING(C). { PARSER_TRACE; A = createRawExprNodeExt(pCxt, &B, &C, createValueNode(pCxt, TSDB_DATA_TYPE_TIMESTAMP, &C)); }
literal(A) ::= duration_literal(B). { PARSER_TRACE; A = B; }
duration_literal(A) ::= NK_VARIABLE(B). { PARSER_TRACE; A = createDurationValueNode(pCxt, &B); }
duration_literal(A) ::= NK_VARIABLE(B). { PARSER_TRACE; A = createRawExprNode(pCxt, &B, createDurationValueNode(pCxt, &B)); }
%type literal_list { SNodeList* }
%destructor literal_list { PARSER_DESTRUCTOR_TRACE; nodesDestroyList($$); }
literal_list(A) ::= literal(B). { PARSER_TRACE; A = createNodeList(pCxt, B); }
literal_list(A) ::= literal_list(B) NK_COMMA literal(C). { PARSER_TRACE; A = addNodeToList(pCxt, B, C); }
literal_list(A) ::= literal(B). { PARSER_TRACE; A = createNodeList(pCxt, releaseRawExprNode(pCxt, B)); }
literal_list(A) ::= literal_list(B) NK_COMMA literal(C). { PARSER_TRACE; A = addNodeToList(pCxt, B, releaseRawExprNode(pCxt, C)); }
/************************************************ names and identifiers ***********************************************/
%type db_name { SToken }
......@@ -111,37 +111,70 @@ expression(A) ::= literal(B).
//expression(A) ::= NK_QUESTION(B). { PARSER_TRACE; A = B; }
//expression(A) ::= pseudo_column(B). { PARSER_TRACE; A = B; }
expression(A) ::= column_reference(B). { PARSER_TRACE; A = B; }
expression(A) ::= function_name(B) NK_LP expression_list(C) NK_RP. { PARSER_TRACE; A = createFunctionNode(pCxt, &B, C); }
expression(A) ::= function_name(B) NK_LP expression_list(C) NK_RP(D). { PARSER_TRACE; A = createRawExprNodeExt(pCxt, &B, &D, createFunctionNode(pCxt, &B, C)); }
//expression(A) ::= cast_expression(B). { PARSER_TRACE; A = B; }
//expression(A) ::= case_expression(B). { PARSER_TRACE; A = B; }
expression(A) ::= subquery(B). { PARSER_TRACE; A = B; }
expression(A) ::= NK_LP expression(B) NK_RP. { PARSER_TRACE; A = B; }
expression(A) ::= NK_PLUS expression(B). { PARSER_TRACE; A = B; }
expression(A) ::= NK_MINUS expression(B). { PARSER_TRACE; A = createOperatorNode(pCxt, OP_TYPE_SUB, B, NULL); }
expression(A) ::= expression(B) NK_PLUS expression(C). { PARSER_TRACE; A = createOperatorNode(pCxt, OP_TYPE_ADD, B, C); }
expression(A) ::= expression(B) NK_MINUS expression(C). { PARSER_TRACE; A = createOperatorNode(pCxt, OP_TYPE_SUB, B, C); }
expression(A) ::= expression(B) NK_STAR expression(C). { PARSER_TRACE; A = createOperatorNode(pCxt, OP_TYPE_MULTI, B, C); }
expression(A) ::= expression(B) NK_SLASH expression(C). { PARSER_TRACE; A = createOperatorNode(pCxt, OP_TYPE_DIV, B, C); }
expression(A) ::= expression(B) NK_REM expression(C). { PARSER_TRACE; A = createOperatorNode(pCxt, OP_TYPE_MOD, B, C); }
expression(A) ::= NK_LP(B) expression(C) NK_RP(D). { PARSER_TRACE; A = createRawExprNodeExt(pCxt, &B, &D, releaseRawExprNode(pCxt, C)); }
expression(A) ::= NK_PLUS(B) expression(C). {
PARSER_TRACE;
SToken t = getTokenFromRawExprNode(pCxt, C);
A = createRawExprNodeExt(pCxt, &B, &t, releaseRawExprNode(pCxt, C));
}
expression(A) ::= NK_MINUS(B) expression(C). {
PARSER_TRACE;
SToken t = getTokenFromRawExprNode(pCxt, C);
A = createRawExprNodeExt(pCxt, &B, &t, createOperatorNode(pCxt, OP_TYPE_SUB, releaseRawExprNode(pCxt, C), NULL));
}
expression(A) ::= expression(B) NK_PLUS expression(C). {
PARSER_TRACE;
SToken s = getTokenFromRawExprNode(pCxt, B);
SToken e = getTokenFromRawExprNode(pCxt, C);
A = createRawExprNodeExt(pCxt, &s, &e, createOperatorNode(pCxt, OP_TYPE_ADD, releaseRawExprNode(pCxt, B), releaseRawExprNode(pCxt, C)));
}
expression(A) ::= expression(B) NK_MINUS expression(C). {
PARSER_TRACE;
SToken s = getTokenFromRawExprNode(pCxt, B);
SToken e = getTokenFromRawExprNode(pCxt, C);
A = createRawExprNodeExt(pCxt, &s, &e, createOperatorNode(pCxt, OP_TYPE_SUB, releaseRawExprNode(pCxt, B), releaseRawExprNode(pCxt, C)));
}
expression(A) ::= expression(B) NK_STAR expression(C). {
PARSER_TRACE;
SToken s = getTokenFromRawExprNode(pCxt, B);
SToken e = getTokenFromRawExprNode(pCxt, C);
A = createRawExprNodeExt(pCxt, &s, &e, createOperatorNode(pCxt, OP_TYPE_MULTI, releaseRawExprNode(pCxt, B), releaseRawExprNode(pCxt, C)));
}
expression(A) ::= expression(B) NK_SLASH expression(C). {
PARSER_TRACE;
SToken s = getTokenFromRawExprNode(pCxt, B);
SToken e = getTokenFromRawExprNode(pCxt, C);
A = createRawExprNodeExt(pCxt, &s, &e, createOperatorNode(pCxt, OP_TYPE_DIV, releaseRawExprNode(pCxt, B), releaseRawExprNode(pCxt, C)));
}
expression(A) ::= expression(B) NK_REM expression(C). {
PARSER_TRACE;
SToken s = getTokenFromRawExprNode(pCxt, B);
SToken e = getTokenFromRawExprNode(pCxt, C);
A = createRawExprNodeExt(pCxt, &s, &e, createOperatorNode(pCxt, OP_TYPE_MOD, releaseRawExprNode(pCxt, B), releaseRawExprNode(pCxt, C)));
}
%type expression_list { SNodeList* }
%destructor expression_list { PARSER_DESTRUCTOR_TRACE; nodesDestroyList($$); }
expression_list(A) ::= expression(B). { PARSER_TRACE; A = createNodeList(pCxt, B); }
expression_list(A) ::= expression_list(B) NK_COMMA expression(C). { PARSER_TRACE; A = addNodeToList(pCxt, B, C); }
expression_list(A) ::= expression(B). { PARSER_TRACE; A = createNodeList(pCxt, releaseRawExprNode(pCxt, B)); }
expression_list(A) ::= expression_list(B) NK_COMMA expression(C). { PARSER_TRACE; A = addNodeToList(pCxt, B, releaseRawExprNode(pCxt, C)); }
column_reference(A) ::= column_name(B). { PARSER_TRACE; A = createColumnNode(pCxt, NULL, &B); }
column_reference(A) ::= table_name(B) NK_DOT column_name(C). { PARSER_TRACE; A = createColumnNode(pCxt, &B, &C); }
column_reference(A) ::= column_name(B). { PARSER_TRACE; A = createRawExprNode(pCxt, &B, createColumnNode(pCxt, NULL, &B)); }
column_reference(A) ::= table_name(B) NK_DOT column_name(C). { PARSER_TRACE; A = createRawExprNodeExt(pCxt, &B, &C, createColumnNode(pCxt, &B, &C)); }
//pseudo_column(A) ::= NK_NOW. { PARSER_TRACE; A = createFunctionNode(pCxt, NULL, NULL); }
/************************************************ predicate ***********************************************************/
predicate(A) ::= expression(B) compare_op(C) expression(D). { PARSER_TRACE; A = createOperatorNode(pCxt, C, B, D); }
predicate(A) ::= expression(B) compare_op(C) expression(D). { PARSER_TRACE; A = createOperatorNode(pCxt, C, releaseRawExprNode(pCxt, B), releaseRawExprNode(pCxt, D)); }
//predicate(A) ::= expression(B) compare_op sub_type expression(B).
predicate(A) ::= expression(B) BETWEEN expression(C) AND expression(D). { PARSER_TRACE; A = createBetweenAnd(pCxt, B, C, D); }
predicate(A) ::= expression(B) NOT BETWEEN expression(C) AND expression(D). { PARSER_TRACE; A = createNotBetweenAnd(pCxt, C, B, D); }
predicate(A) ::= expression(B) IS NULL. { PARSER_TRACE; A = createIsNullCondNode(pCxt, B, true); }
predicate(A) ::= expression(B) IS NOT NULL. { PARSER_TRACE; A = createIsNullCondNode(pCxt, B, false); }
predicate(A) ::= expression(B) in_op(C) in_predicate_value(D). { PARSER_TRACE; A = createOperatorNode(pCxt, C, B, D); }
predicate(A) ::= expression(B) BETWEEN expression(C) AND expression(D). { PARSER_TRACE; A = createBetweenAnd(pCxt, releaseRawExprNode(pCxt, B), releaseRawExprNode(pCxt, C), releaseRawExprNode(pCxt, D)); }
predicate(A) ::= expression(B) NOT BETWEEN expression(C) AND expression(D). { PARSER_TRACE; A = createNotBetweenAnd(pCxt, releaseRawExprNode(pCxt, C), releaseRawExprNode(pCxt, B), releaseRawExprNode(pCxt, D)); }
predicate(A) ::= expression(B) IS NULL. { PARSER_TRACE; A = createIsNullCondNode(pCxt, releaseRawExprNode(pCxt, B), true); }
predicate(A) ::= expression(B) IS NOT NULL. { PARSER_TRACE; A = createIsNullCondNode(pCxt, releaseRawExprNode(pCxt, B), false); }
predicate(A) ::= expression(B) in_op(C) in_predicate_value(D). { PARSER_TRACE; A = createOperatorNode(pCxt, C, releaseRawExprNode(pCxt, B), D); }
%type compare_op { EOperatorType }
%destructor compare_op { PARSER_DESTRUCTOR_TRACE; }
......@@ -186,7 +219,7 @@ table_reference(A) ::= joined_table(B).
table_primary(A) ::= table_name(B) alias_opt(C). { PARSER_TRACE; A = createRealTableNode(pCxt, NULL, &B, &C); }
table_primary(A) ::= db_name(B) NK_DOT table_name(C) alias_opt(D). { PARSER_TRACE; A = createRealTableNode(pCxt, &B, &C, &D); }
table_primary(A) ::= subquery(B) alias_opt(C). { PARSER_TRACE; A = createTempTableNode(pCxt, B, &C); }
table_primary(A) ::= subquery(B) alias_opt(C). { PARSER_TRACE; A = createTempTableNode(pCxt, releaseRawExprNode(pCxt, B), &C); }
table_primary(A) ::= parenthesized_joined_table(B). { PARSER_TRACE; A = B; }
%type alias_opt { SToken }
......@@ -236,9 +269,13 @@ select_list(A) ::= select_sublist(B).
select_sublist(A) ::= select_item(B). { PARSER_TRACE; A = createNodeList(pCxt, B); }
select_sublist(A) ::= select_sublist(B) NK_COMMA select_item(C). { PARSER_TRACE; A = addNodeToList(pCxt, B, C); }
select_item(A) ::= expression(B). { PARSER_TRACE; A = B; }
select_item(A) ::= expression(B) column_alias(C). { PARSER_TRACE; A = setProjectionAlias(pCxt, B, &C); }
select_item(A) ::= expression(B) AS column_alias(C). { PARSER_TRACE; A = setProjectionAlias(pCxt, B, &C); }
select_item(A) ::= expression(B). {
PARSER_TRACE;
SToken t = getTokenFromRawExprNode(pCxt, B);
A = setProjectionAlias(pCxt, releaseRawExprNode(pCxt, B), &t);
}
select_item(A) ::= expression(B) column_alias(C). { PARSER_TRACE; A = setProjectionAlias(pCxt, releaseRawExprNode(pCxt, B), &C); }
select_item(A) ::= expression(B) AS column_alias(C). { PARSER_TRACE; A = setProjectionAlias(pCxt, releaseRawExprNode(pCxt, B), &C); }
select_item(A) ::= table_name(B) NK_DOT NK_STAR(C). { PARSER_TRACE; A = createColumnNode(pCxt, &B, &C); }
where_clause_opt(A) ::= . { PARSER_TRACE; A = NULL; }
......@@ -251,8 +288,8 @@ partition_by_clause_opt(A) ::= PARTITION BY expression_list(B).
twindow_clause_opt(A) ::= . { PARSER_TRACE; A = NULL; }
twindow_clause_opt(A) ::=
SESSION NK_LP column_reference(B) NK_COMMA NK_INTEGER(C) NK_RP. { PARSER_TRACE; A = createSessionWindowNode(pCxt, B, &C); }
twindow_clause_opt(A) ::= STATE_WINDOW NK_LP column_reference(B) NK_RP. { PARSER_TRACE; A = createStateWindowNode(pCxt, B); }
SESSION NK_LP column_reference(B) NK_COMMA NK_INTEGER(C) NK_RP. { PARSER_TRACE; A = createSessionWindowNode(pCxt, releaseRawExprNode(pCxt, B), &C); }
twindow_clause_opt(A) ::= STATE_WINDOW NK_LP column_reference(B) NK_RP. { PARSER_TRACE; A = createStateWindowNode(pCxt, releaseRawExprNode(pCxt, B)); }
twindow_clause_opt(A) ::=
INTERVAL NK_LP duration_literal(B) NK_RP sliding_opt(C) fill_opt(D). { PARSER_TRACE; A = createIntervalWindowNode(pCxt, B, NULL, C, D); }
twindow_clause_opt(A) ::=
......@@ -317,7 +354,7 @@ limit_clause_opt(A) ::= LIMIT NK_INTEGER(B) OFFSET NK_INTEGER(C).
limit_clause_opt(A) ::= LIMIT NK_INTEGER(C) NK_COMMA NK_INTEGER(B). { PARSER_TRACE; A = createLimitNode(pCxt, &B, &C); }
/************************************************ subquery ************************************************************/
subquery(A) ::= NK_LP query_expression(B) NK_RP. { PARSER_TRACE; A = B; }
subquery(A) ::= NK_LP(B) query_expression(C) NK_RP(D). { PARSER_TRACE; A = createRawExprNodeExt(pCxt, &B, &D, C); }
/************************************************ search_condition ****************************************************/
search_condition(A) ::= boolean_value_expression(B). { PARSER_TRACE; A = B; }
......@@ -330,7 +367,7 @@ sort_specification_list(A) ::=
sort_specification_list(B) NK_COMMA sort_specification(C). { PARSER_TRACE; A = addNodeToList(pCxt, B, C); }
sort_specification(A) ::=
expression(B) ordering_specification_opt(C) null_ordering_opt(D). { PARSER_TRACE; A = createOrderByExprNode(pCxt, B, C, D); }
expression(B) ordering_specification_opt(C) null_ordering_opt(D). { PARSER_TRACE; A = createOrderByExprNode(pCxt, releaseRawExprNode(pCxt, B), C, D); }
%type ordering_specification_opt EOrder
%destructor ordering_specification_opt { PARSER_DESTRUCTOR_TRACE; }
......
source/libs/parser/src/astCreateFuncs.c
浏览文件 @ 69d19681
......@@ -24,6 +24,14 @@
} \
} while (0)
#define CHECK_RAW_EXPR_NODE(node) \
do { \
if (NULL == (node) || QUERY_NODE_RAW_EXPR != nodeType(node)) { \
pCxt->valid = false; \
return NULL; \
} \
} while (0)
SToken nil_token = { .type = TK_NIL, .n = 0, .z = NULL };
static bool checkDbName(SAstCreateContext* pCxt, const SToken* pDbName) {
......@@ -50,6 +58,37 @@ static bool checkColumnName(SAstCreateContext* pCxt, const SToken* pColumnName)
return pCxt->valid;
}
SNode* createRawExprNode(SAstCreateContext* pCxt, const SToken* pToken, SNode* pNode) {
SRawExprNode* target = (SRawExprNode*)nodesMakeNode(QUERY_NODE_RAW_EXPR);
CHECK_OUT_OF_MEM(target);
target->p = pToken->z;
target->n = pToken->n;
target->pNode = pNode;
return (SNode*)target;
}
SNode* createRawExprNodeExt(SAstCreateContext* pCxt, const SToken* pStart, const SToken* pEnd, SNode* pNode) {
SRawExprNode* target = (SRawExprNode*)nodesMakeNode(QUERY_NODE_RAW_EXPR);
CHECK_OUT_OF_MEM(target);
target->p = pStart->z;
target->n = (pEnd->z + pEnd->n) - pStart->z;
target->pNode = pNode;
return (SNode*)target;
}
SNode* releaseRawExprNode(SAstCreateContext* pCxt, SNode* pNode) {
CHECK_RAW_EXPR_NODE(pNode);
SNode* tmp = ((SRawExprNode*)pNode)->pNode;
tfree(pNode);
return tmp;
}
SToken getTokenFromRawExprNode(SAstCreateContext* pCxt, SNode* pNode) {
SRawExprNode* target = (SRawExprNode*)pNode;
SToken t = { .type = 0, .z = target->p, .n = target->n};
return t;
}
SNodeList* createNodeList(SAstCreateContext* pCxt, SNode* pNode) {
SNodeList* list = nodesMakeList();
CHECK_OUT_OF_MEM(list);
......@@ -86,7 +125,7 @@ SNode* createValueNode(SAstCreateContext* pCxt, int32_t dataType, const SToken*
SNode* createDurationValueNode(SAstCreateContext* pCxt, const SToken* pLiteral) {
SValueNode* val = (SValueNode*)nodesMakeNode(QUERY_NODE_VALUE);
CHECK_OUT_OF_MEM(val);
// todo
// todo : calc, for example, 10s
return (SNode*)val;
}
......
source/libs/parser/src/new_sql.c
浏览文件 @ 69d19681
此差异已折叠。
source/nodes/src/nodesTraverseFuncs.c
浏览文件 @ 69d19681
......@@ -75,6 +75,35 @@ static bool walkNode(SNode* pNode, ETraversalOrder order, FQueryNodeWalker walke
case QUERY_NODE_ORDER_BY_EXPR:
res = walkNode(((SOrderByExprNode*)pNode)->pExpr, order, walker, pContext);
break;
case QUERY_NODE_STATE_WINDOW:
res = walkNode(((SStateWindowNode*)pNode)->pCol, order, walker, pContext);
break;
case QUERY_NODE_SESSION_WINDOW:
res = walkNode(((SSessionWindowNode*)pNode)->pCol, order, walker, pContext);
break;
case QUERY_NODE_INTERVAL_WINDOW: {
SIntervalWindowNode* pInterval = (SIntervalWindowNode*)pNode;
res = walkNode(pInterval->pInterval, order, walker, pContext);
if (res) {
res = walkNode(pInterval->pOffset, order, walker, pContext);
}
if (res) {
res = walkNode(pInterval->pSliding, order, walker, pContext);
}
if (res) {
res = walkNode(pInterval->pFill, order, walker, pContext);
}
break;
}
case QUERY_NODE_NODE_LIST:
res = walkList(((SNodeListNode*)pNode)->pNodeList, order, walker, pContext);
break;
case QUERY_NODE_FILL:
res = walkNode(((SFillNode*)pNode)->pValues, order, walker, pContext);
break;
case QUERY_NODE_RAW_EXPR:
res = walkNode(((SRawExprNode*)pNode)->pNode, order, walker, pContext);
break;
default:
break;
}
......
source/nodes/src/nodesUtilFuncs.c
浏览文件 @ 69d19681
......@@ -58,6 +58,12 @@ SNode* nodesMakeNode(ENodeType type) {
return makeNode(type, sizeof(SSessionWindowNode));
case QUERY_NODE_INTERVAL_WINDOW:
return makeNode(type, sizeof(SIntervalWindowNode));
case QUERY_NODE_NODE_LIST:
return makeNode(type, sizeof(SNodeListNode));
case QUERY_NODE_FILL:
return makeNode(type, sizeof(SFillNode));
case QUERY_NODE_RAW_EXPR:
return makeNode(type, sizeof(SRawExprNode));
case QUERY_NODE_SET_OPERATOR:
return makeNode(type, sizeof(SSetOperator));
case QUERY_NODE_SELECT_STMT:
......@@ -74,7 +80,7 @@ static bool destroyNode(SNode* pNode, void* pContext) {
switch (nodeType(pNode)) {
case QUERY_NODE_VALUE:
tfree(((SValueNode*)pNode)->literal);
break;
break;
default:
break;
}
......
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