我已经创建了如下语法，但我收到错误消息“第1行：0输入'语法'没有可行的选择”。我的语法有问题吗？
=================语法开始============================ =====
grammar SglV1;
parse
: sgl_stmt
;
sgl_stmt
: create_stream_stmt
| drop_stream_stmt
;
create_stream_stmt
:K_CREATE K_STREAM IDENTIFIER '.' IDENTIFIER K_AS factored_pick_stmt
;
drop_stream_stmt
: K_DROP K_STREAM IDENTIFIER '.' IDENTIFIER
;
factored_pick_stmt
: pick_core ( compound_operator pick_core )*
;
pick_core
: K_PICK ( K_TOP NUMERIC_LITERAL )? K_WHERE expr
;
expr
: STRING_LITERAL
| IDENTIFIER '.' IDENTIFIER
| expr ( '==' | '' ) expr
| expr K_AND expr
| expr K_OR expr
| '(' expr ')'
;
compound_operator
: K_UNION
| K_INTERSECT
| K_EXCEPT
;
keyword
: K_ABORT
| K_ACTION
| K_ADD
| K_AFTER
| K_ALL
| K_ALTER
| K_ANALYZE
| K_AND
| K_AS
| K_ASC
| K_ATTACH
| K_AUTOINCREMENT
| K_BEFORE
| K_BEGIN
| K_BETWEEN
| K_BY
| K_CASCADE
| K_CASE
| K_CAST
| K_CHECK
| K_COLLATE
| K_COLUMN
| K_COMMIT
| K_CONFLICT
| K_CONSTRAINT
| K_CREATE
| K_CROSS
| K_CURRENT_DATE
| K_CURRENT_TIME
| K_CURRENT_TIMESTAMP
| K_DATABASE
| K_DEFAULT
| K_DEFERRABLE
| K_DEFERRED
| K_DELETE
| K_DESC
| K_DETACH
| K_DISTINCT
| K_DROP
| K_EACH
| K_ELSE
| K_END
| K_ESCAPE
| K_EXCEPT
| K_EXCLUSIVE
| K_EXISTS
| K_EXPLAIN
| K_FAIL
| K_FOR
| K_FOREIGN
| K_FROM
| K_FULL
| K_GLOB
| K_GROUP
| K_HAVING
| K_IF
| K_IGNORE
| K_IMMEDIATE
| K_IN
| K_INDEX
| K_INDEXED
| K_INITIALLY
| K_INNER
| K_INSERT
| K_INSTEAD
| K_INTERSECT
| K_INTO
| K_IS
| K_ISNULL
| K_JOIN
| K_KEY
| K_LEFT
| K_LIKE
| K_TOP
| K_MATCH
| K_NATURAL
| K_NO
| K_NOT
| K_NOTNULL
| K_NULL
| K_OF
| K_OFFSET
| K_ON
| K_OR
| K_ORDER
| K_OUTER
| K_PLAN
| K_PRAGMA
| K_PRIMARY
| K_QUERY
| K_RAISE
| K_RECURSIVE
| K_REFERENCES
| K_REGEXP
| K_REINDEX
| K_RELEASE
| K_RENAME
| K_REPLACE
| K_RESTRICT
| K_RIGHT
| K_ROLLBACK
| K_ROW
| K_SAVEPOINT
| K_PICK
| K_SET
| K_STREAM
| K_TEMP
| K_TEMPORARY
| K_THEN
| K_TO
| K_TRANSACTION
| K_TRIGGER
| K_UNION
| K_UNIQUE
| K_UPDATE
| K_USING
| K_VACUUM
| K_VALUES
| K_VIEW
| K_VIRTUAL
| K_WHEN
| K_WHERE
| K_WITH
| K_WITHOUT
;
SCOL : ';';
DOT : '.';
OPEN_PAR : '(';
CLOSE_PAR : ')';
COMMA : ',';
STAR : '*';
PLUS : '+';
MINUS : '-';
TILDE : '~';
PIPE2 : '||';
DIV : '/';
MOD : '%';
LT2 : '>';
AMP : '&';
PIPE : '|';
LT : '';
GT_EQ : '>=';
EQ : '==';
NOT_EQ : '';
K_ABORT : A B O R T;
K_ACTION : A C T I O N;
K_ADD : A D D;
K_AFTER : A F T E R;
K_ALL : A L L;
K_ALTER : A L T E R;
K_ANALYZE : A N A L Y Z E;
K_AND : A N D;
K_AS : A S;
K_ASC : A S C;
K_ATTACH : A T T A C H;
K_AUTOINCREMENT : A U T O I N C R E M E N T;
K_BEFORE : B E F O R E;
K_BEGIN : B E G I N;
K_BETWEEN : B E T W E E N;
K_BY : B Y;
K_CASCADE : C A S C A D E;
K_CASE : C A S E;
K_CAST : C A S T;
K_CHECK : C H E C K;
K_COLLATE : C O L L A T E;
K_COLUMN : C O L U M N;
K_COMMIT : C O M M I T;
K_CONFLICT : C O N F L I C T;
K_CONSTRAINT : C O N S T R A I N T;
K_CREATE : C R E A T E;
K_CROSS : C R O S S;
K_CURRENT_DATE : C U R R E N T '_' D A T E;
K_CURRENT_TIME : C U R R E N T '_' T I M E;
K_CURRENT_TIMESTAMP : C U R R E N T '_' T I M E S T A M P;
K_DATABASE : D A T A B A S E;
K_DEFAULT : D E F A U L T;
K_DEFERRABLE : D E F E R R A B L E;
K_DEFERRED : D E F E R R E D;
K_DELETE : D E L E T E;
K_DESC : D E S C;
K_DETACH : D E T A C H;
K_DISTINCT : D I S T I N C T;
K_DROP : D R O P;
K_EACH : E A C H;
K_ELSE : E L S E;
K_END : E N D;
K_ESCAPE : E S C A P E;
K_EXCEPT : E X C E P T;
K_EXCLUSIVE : E X C L U S I V E;
K_EXISTS : E X I S T S;
K_EXPLAIN : E X P L A I N;
K_FAIL : F A I L;
K_FOR : F O R;
K_FOREIGN : F O R E I G N;
K_FROM : F R O M;
K_FULL : F U L L;
K_GLOB : G L O B;
K_GROUP : G R O U P;
K_HAVING : H A V I N G;
K_IF : I F;
K_IGNORE : I G N O R E;
K_IMMEDIATE : I M M E D I A T E;
K_IN : I N;
K_INDEX : I N D E X;
K_INDEXED : I N D E X E D;
K_INITIALLY : I N I T I A L L Y;
K_INNER : I N N E R;
K_INSERT : I N S E R T;
K_INSTEAD : I N S T E A D;
K_INTERSECT : I N T E R S E C T;
K_INTO : I N T O;
K_IS : I S;
K_ISNULL : I S N U L L;
K_JOIN : J O I N;
K_KEY : K E Y;
K_LEFT : L E F T;
K_LIKE : L I K E;
K_TOP : T O P;
K_MATCH : M A T C H;
K_NATURAL : N A T U R A L;
K_NO : N O;
K_NOT : N O T;
K_NOTNULL : N O T N U L L;
K_NULL : N U L L;
K_OF : O F;
K_OFFSET : O F F S E T;
K_ON : O N;
K_OR : O R;
K_ORDER : O R D E R;
K_OUTER : O U T E R;
K_PLAN : P L A N;
K_PRAGMA : P R A G M A;
K_PRIMARY : P R I M A R Y;
K_QUERY : Q U E R Y;
K_RAISE : R A I S E;
K_RECURSIVE : R E C U R S I V E;
K_REFERENCES : R E F E R E N C E S;
K_REGEXP : R E G E X P;
K_REINDEX : R E I N D E X;
K_RELEASE : R E L E A S E;
K_RENAME : R E N A M E;
K_REPLACE : R E P L A C E;
K_RESTRICT : R E S T R I C T;
K_RIGHT : R I G H T;
K_ROLLBACK : R O L L B A C K;
K_ROW : R O W;
K_SAVEPOINT : S A V E P O I N T;
K_PICK : P I C K;
K_SET : S E T;
K_STREAM : S T R E A M ;
K_TEMP : T E M P;
K_TEMPORARY : T E M P O R A R Y;
K_THEN : T H E N;
K_TO : T O;
K_TRANSACTION : T R A N S A C T I O N;
K_TRIGGER : T R I G G E R;
K_UNION : U N I O N;
K_UNIQUE : U N I Q U E;
K_UPDATE : U P D A T E;
K_USING : U S I N G;
K_VACUUM : V A C U U M;
K_VALUES : V A L U E S;
K_VIEW : V I E W;
K_VIRTUAL : V I R T U A L;
K_WHEN : W H E N;
K_WHERE : W H E R E;
K_WITH : W I T H;
K_WITHOUT : W I T H O U T;
IDENTIFIER
: [a-zA-Z_] [a-zA-Z_0-9]*
;
NUMERIC_LITERAL
: DIGIT+ ( '.' DIGIT* )? ( E [-+]? DIGIT+ )?
| '.' DIGIT+ ( E [-+]? DIGIT+ )?
;
STRING_LITERAL
: '\'' ( ~'\'' | '\'\'' )* '\''
;
SINGLE_LINE_COMMENT
: '--' ~[\r\n]* -> channel(HIDDEN)
;
SPACES
: [ \u000B\t\r\n] -> channel(HIDDEN)
;
UNEXPECTED_CHAR
: .
;
fragment DIGIT : [0-9];
fragment A : [A];
fragment B : [B];
fragment C : [C];
fragment D : [D];
fragment E : [E];
fragment F : [F];
fragment G : [G];
fragment H : [H];
fragment I : [I];
fragment J : [J];
fragment K : [K];
fragment L : [L];
fragment M : [M];
fragment N : [N];
fragment O : [O];
fragment P : [P];
fragment Q : [Q];
fragment R : [R];
fragment S : [S];
fragment T : [T];
fragment U : [U];
fragment V : [V];
fragment W : [W];
fragment X : [X];
fragment Y : [Y];
fragment Z : [Z];
======语法结束==============