add syntax for show tags/index/table tags from db.tb

source/libs/parser/inc/sql.y

@@ -447,6 +447,7 @@ cmd ::= SHOW MNODES.
 cmd ::= SHOW QNODES.                                                              { pCxt->pRootNode = createShowStmt(pCxt, QUERY_NODE_SHOW_QNODES_STMT); }
 cmd ::= SHOW FUNCTIONS.                                                           { pCxt->pRootNode = createShowStmt(pCxt, QUERY_NODE_SHOW_FUNCTIONS_STMT); }
 cmd ::= SHOW INDEXES FROM table_name_cond(A) from_db_opt(B).                      { pCxt->pRootNode = createShowStmtWithCond(pCxt, QUERY_NODE_SHOW_INDEXES_STMT, B, A, OP_TYPE_EQUAL); }
+cmd ::= SHOW INDEXES FROM db_name(B) NK_DOT table_name(A).                        { pCxt->pRootNode = createShowStmtWithCond(pCxt, QUERY_NODE_SHOW_INDEXES_STMT, createIdentifierValueNode(pCxt, &B), createIdentifierValueNode(pCxt, &A), OP_TYPE_EQUAL); }
 cmd ::= SHOW STREAMS.                                                             { pCxt->pRootNode = createShowStmt(pCxt, QUERY_NODE_SHOW_STREAMS_STMT); }
 cmd ::= SHOW ACCOUNTS.                                                            { pCxt->errCode = generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_EXPRIE_STATEMENT); }
 cmd ::= SHOW APPS.                                                                { pCxt->pRootNode = createShowStmt(pCxt, QUERY_NODE_SHOW_APPS_STMT); }
@@ -471,7 +472,9 @@ cmd ::= SHOW TABLE DISTRIBUTED full_table_name(A).
 cmd ::= SHOW CONSUMERS.                                                           { pCxt->pRootNode = createShowStmt(pCxt, QUERY_NODE_SHOW_CONSUMERS_STMT); }
 cmd ::= SHOW SUBSCRIPTIONS.                                                       { pCxt->pRootNode = createShowStmt(pCxt, QUERY_NODE_SHOW_SUBSCRIPTIONS_STMT); }
 cmd ::= SHOW TAGS FROM table_name_cond(A) from_db_opt(B).                         { pCxt->pRootNode = createShowStmtWithCond(pCxt, QUERY_NODE_SHOW_TAGS_STMT, B, A, OP_TYPE_EQUAL); }
+cmd ::= SHOW TAGS FROM db_name(B) NK_DOT table_name(A).                           { pCxt->pRootNode = createShowStmtWithCond(pCxt, QUERY_NODE_SHOW_TAGS_STMT, createIdentifierValueNode(pCxt, &B), createIdentifierValueNode(pCxt, &A), OP_TYPE_EQUAL); }
 cmd ::= SHOW TABLE TAGS tag_list_opt(C) FROM table_name_cond(A) from_db_opt(B).   { pCxt->pRootNode = createShowTableTagsStmt(pCxt, A, B, C); }
+cmd ::= SHOW TABLE TAGS tag_list_opt(C) FROM db_name(B) NK_DOT table_name(A).     { pCxt->pRootNode = createShowTableTagsStmt(pCxt, createIdentifierValueNode(pCxt, &A), createIdentifierValueNode(pCxt, &B), C); }
 cmd ::= SHOW VNODES NK_INTEGER(A).                                                { pCxt->pRootNode = createShowVnodesStmt(pCxt, createValueNode(pCxt, TSDB_DATA_TYPE_BIGINT, &A), NULL); }
 cmd ::= SHOW VNODES NK_STRING(A).                                                 { pCxt->pRootNode = createShowVnodesStmt(pCxt, NULL, createValueNode(pCxt, TSDB_DATA_TYPE_VARCHAR, &A)); }
 // show alive
@@ -485,7 +488,6 @@ like_pattern_opt(A) ::= .
 like_pattern_opt(A) ::= LIKE NK_STRING(B).                                        { A = createValueNode(pCxt, TSDB_DATA_TYPE_BINARY, &B); }
 
 table_name_cond(A) ::= table_name(B).                                             { A = createIdentifierValueNode(pCxt, &B); }
-table_name_cond(A) ::= db_name(B) NK_DOT table_name(C).                           { A = createRealTableNode(pCxt, &B, &C, NULL); }
 
 from_db_opt(A) ::= .                                                              { A = createDefaultDatabaseCondValue(pCxt); }
 from_db_opt(A) ::= FROM db_name(B).                                               { A = createIdentifierValueNode(pCxt, &B); }