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Overview
Comment:Parse common table expressions. But do not do anything with them (yet).
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Timelines: family | ancestors | descendants | both | common-table-expr
Files: files | file ages | folders
SHA1: da98b7205eb3d7ec2ddbf8a8e24eee0b2ff499a5
User & Date: drh 2014-01-11 13:22:17
Context
2014-01-11
19:19
Update the parser so that sub-queries and CTEs may have WITH clauses. check-in: 704d3931 user: dan tags: common-table-expr
13:22
Parse common table expressions. But do not do anything with them (yet). check-in: da98b720 user: drh tags: common-table-expr
12:52
In LEMON, limit the size of the grammar file to 100MB. This ensures that the program will never experience integer overflow. To be doubly sure, use calloc() instead of malloc() when allocating arrays. check-in: 29ba458d user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/build.c. 

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      }else{
        pIdx->pKeyInfo = pKey;
      }
    }
  }
  return sqlite3KeyInfoRef(pIdx->pKeyInfo);
}





























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      }else{
        pIdx->pKeyInfo = pKey;
      }
    }
  }
  return sqlite3KeyInfoRef(pIdx->pKeyInfo);
}

#ifndef SQLITE_OMIT_CTE
/* This routine is invoked when a single with_query of a
** common-table-expression has been parsed.  Record the query.
*/
void sqlite3CteAdd(
  Parse *pParse,          /* Parsing context */
  Token *pName,           /* Name of the common-table */
  ExprList *pArgList,     /* Optional column name list for the table */
  Select *pQuery          /* Query used to initialize the table */
){
  sqlite3ExprListDelete(pParse->db, pArgList);
  sqlite3SelectDelete(pParse->db, pQuery);
}

/* This routine is invoked at the end of the entire WITH clause.
*/
void sqlite3CteFinish(Parse *pParse, int isRecursive){
  /* TBD */
}
#endif /* !defined(SQLITE_OMIT_CTE) */

Changes to src/parse.y. 

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// fallback to ID if they will not parse as their original value.
// This obviates the need for the "id" nonterminal.
//
%fallback ID
  ABORT ACTION AFTER ANALYZE ASC ATTACH BEFORE BEGIN BY CASCADE CAST COLUMNKW
  CONFLICT DATABASE DEFERRED DESC DETACH EACH END EXCLUSIVE EXPLAIN FAIL FOR
  IGNORE IMMEDIATE INITIALLY INSTEAD LIKE_KW MATCH NO PLAN
  QUERY KEY OF OFFSET PRAGMA RAISE RELEASE REPLACE RESTRICT ROW ROLLBACK
  SAVEPOINT TEMP TRIGGER VACUUM VIEW VIRTUAL WITHOUT
%ifdef SQLITE_OMIT_COMPOUND_SELECT
  EXCEPT INTERSECT UNION
%endif SQLITE_OMIT_COMPOUND_SELECT
  REINDEX RENAME CTIME_KW IF
  .
%wildcard ANY.

................................................................................
cmd ::= DROP VIEW ifexists(E) fullname(X). {
  sqlite3DropTable(pParse, X, 1, E);
}
%endif  SQLITE_OMIT_VIEW

//////////////////////// The SELECT statement /////////////////////////////////
//
cmd ::= select(X).  {
  SelectDest dest = {SRT_Output, 0, 0, 0, 0};
  sqlite3Select(pParse, X, &dest);
  sqlite3ExplainBegin(pParse->pVdbe);
  sqlite3ExplainSelect(pParse->pVdbe, X);
  sqlite3ExplainFinish(pParse->pVdbe);
  sqlite3SelectDelete(pParse->db, X);
}
................................................................................
                                      {A.pLimit = X.pExpr; A.pOffset = Y.pExpr;}
limit_opt(A) ::= LIMIT expr(X) COMMA expr(Y). 
                                      {A.pOffset = X.pExpr; A.pLimit = Y.pExpr;}

/////////////////////////// The DELETE statement /////////////////////////////
//
%ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= DELETE FROM fullname(X) indexed_opt(I) where_opt(W) 
        orderby_opt(O) limit_opt(L). {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  W = sqlite3LimitWhere(pParse, X, W, O, L.pLimit, L.pOffset, "DELETE");
  sqlite3DeleteFrom(pParse,X,W);
}
%endif
%ifndef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= DELETE FROM fullname(X) indexed_opt(I) where_opt(W). {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3DeleteFrom(pParse,X,W);
}
%endif

%type where_opt {Expr*}
%destructor where_opt {sqlite3ExprDelete(pParse->db, $$);}
................................................................................

where_opt(A) ::= .                    {A = 0;}
where_opt(A) ::= WHERE expr(X).       {A = X.pExpr;}

////////////////////////// The UPDATE command ////////////////////////////////
//
%ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= UPDATE orconf(R) fullname(X) indexed_opt(I) SET setlist(Y) where_opt(W)
        orderby_opt(O) limit_opt(L).  {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3ExprListCheckLength(pParse,Y,"set list"); 
  W = sqlite3LimitWhere(pParse, X, W, O, L.pLimit, L.pOffset, "UPDATE");
  sqlite3Update(pParse,X,Y,W,R);
}
%endif
%ifndef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= UPDATE orconf(R) fullname(X) indexed_opt(I) SET setlist(Y)
        where_opt(W).  {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3ExprListCheckLength(pParse,Y,"set list"); 
  sqlite3Update(pParse,X,Y,W,R);
}
%endif

................................................................................
setlist(A) ::= nm(X) EQ expr(Y). {
  A = sqlite3ExprListAppend(pParse, 0, Y.pExpr);
  sqlite3ExprListSetName(pParse, A, &X, 1);
}

////////////////////////// The INSERT command /////////////////////////////////
//
cmd ::= insert_cmd(R) INTO fullname(X) inscollist_opt(F) select(S).
            {sqlite3Insert(pParse, X, S, F, R);}
cmd ::= insert_cmd(R) INTO fullname(X) inscollist_opt(F) DEFAULT VALUES.
            {sqlite3Insert(pParse, X, 0, F, R);}

%type insert_cmd {u8}
insert_cmd(A) ::= INSERT orconf(R).   {A = R;}
insert_cmd(A) ::= REPLACE.            {A = OE_Replace;}

%type inscollist_opt {IdList*}
................................................................................
                                        {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) PLUS|MINUS(OP) expr(Y).
                                        {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) STAR|SLASH|REM(OP) expr(Y).
                                        {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) CONCAT(OP) expr(Y). {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
%type likeop {struct LikeOp}
likeop(A) ::= LIKE_KW(X).     {A.eOperator = X; A.bNot = 0;}
likeop(A) ::= NOT LIKE_KW(X). {A.eOperator = X; A.bNot = 1;}
likeop(A) ::= MATCH(X).       {A.eOperator = X; A.bNot = 0;}
likeop(A) ::= NOT MATCH(X).   {A.eOperator = X; A.bNot = 1;}
expr(A) ::= expr(X) likeop(OP) expr(Y).  [LIKE_KW]  {
  ExprList *pList;
  pList = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, X.pExpr);
  A.pExpr = sqlite3ExprFunction(pParse, pList, &OP.eOperator);
  if( OP.bNot ) A.pExpr = sqlite3PExpr(pParse, TK_NOT, A.pExpr, 0, 0);
  A.zStart = X.zStart;
................................................................................
vtabargtoken ::= ANY(X).            {sqlite3VtabArgExtend(pParse,&X);}
vtabargtoken ::= lp anylist RP(X).  {sqlite3VtabArgExtend(pParse,&X);}
lp ::= LP(X).                       {sqlite3VtabArgExtend(pParse,&X);}
anylist ::= .
anylist ::= anylist LP anylist RP.
anylist ::= anylist ANY.
%endif  SQLITE_OMIT_VIRTUALTABLE





















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// fallback to ID if they will not parse as their original value.
// This obviates the need for the "id" nonterminal.
//
%fallback ID
  ABORT ACTION AFTER ANALYZE ASC ATTACH BEFORE BEGIN BY CASCADE CAST COLUMNKW
  CONFLICT DATABASE DEFERRED DESC DETACH EACH END EXCLUSIVE EXPLAIN FAIL FOR
  IGNORE IMMEDIATE INITIALLY INSTEAD LIKE_KW MATCH NO PLAN
  QUERY KEY OF OFFSET PRAGMA RAISE RECURSIVE RELEASE REPLACE RESTRICT ROW
  ROLLBACK SAVEPOINT TEMP TRIGGER VACUUM VIEW VIRTUAL WITH WITHOUT
%ifdef SQLITE_OMIT_COMPOUND_SELECT
  EXCEPT INTERSECT UNION
%endif SQLITE_OMIT_COMPOUND_SELECT
  REINDEX RENAME CTIME_KW IF
  .
%wildcard ANY.

................................................................................
cmd ::= DROP VIEW ifexists(E) fullname(X). {
  sqlite3DropTable(pParse, X, 1, E);
}
%endif  SQLITE_OMIT_VIEW

//////////////////////// The SELECT statement /////////////////////////////////
//
cmd ::= with select(X).  {
  SelectDest dest = {SRT_Output, 0, 0, 0, 0};
  sqlite3Select(pParse, X, &dest);
  sqlite3ExplainBegin(pParse->pVdbe);
  sqlite3ExplainSelect(pParse->pVdbe, X);
  sqlite3ExplainFinish(pParse->pVdbe);
  sqlite3SelectDelete(pParse->db, X);
}
................................................................................
                                      {A.pLimit = X.pExpr; A.pOffset = Y.pExpr;}
limit_opt(A) ::= LIMIT expr(X) COMMA expr(Y). 
                                      {A.pOffset = X.pExpr; A.pLimit = Y.pExpr;}

/////////////////////////// The DELETE statement /////////////////////////////
//
%ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= with DELETE FROM fullname(X) indexed_opt(I) where_opt(W) 
        orderby_opt(O) limit_opt(L). {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  W = sqlite3LimitWhere(pParse, X, W, O, L.pLimit, L.pOffset, "DELETE");
  sqlite3DeleteFrom(pParse,X,W);
}
%endif
%ifndef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= with DELETE FROM fullname(X) indexed_opt(I) where_opt(W). {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3DeleteFrom(pParse,X,W);
}
%endif

%type where_opt {Expr*}
%destructor where_opt {sqlite3ExprDelete(pParse->db, $$);}
................................................................................

where_opt(A) ::= .                    {A = 0;}
where_opt(A) ::= WHERE expr(X).       {A = X.pExpr;}

////////////////////////// The UPDATE command ////////////////////////////////
//
%ifdef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= with UPDATE orconf(R) fullname(X) indexed_opt(I) SET setlist(Y)
        where_opt(W) orderby_opt(O) limit_opt(L).  {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3ExprListCheckLength(pParse,Y,"set list"); 
  W = sqlite3LimitWhere(pParse, X, W, O, L.pLimit, L.pOffset, "UPDATE");
  sqlite3Update(pParse,X,Y,W,R);
}
%endif
%ifndef SQLITE_ENABLE_UPDATE_DELETE_LIMIT
cmd ::= with UPDATE orconf(R) fullname(X) indexed_opt(I) SET setlist(Y)
        where_opt(W).  {
  sqlite3SrcListIndexedBy(pParse, X, &I);
  sqlite3ExprListCheckLength(pParse,Y,"set list"); 
  sqlite3Update(pParse,X,Y,W,R);
}
%endif

................................................................................
setlist(A) ::= nm(X) EQ expr(Y). {
  A = sqlite3ExprListAppend(pParse, 0, Y.pExpr);
  sqlite3ExprListSetName(pParse, A, &X, 1);
}

////////////////////////// The INSERT command /////////////////////////////////
//
cmd ::= with insert_cmd(R) INTO fullname(X) inscollist_opt(F) select(S).
            {sqlite3Insert(pParse, X, S, F, R);}
cmd ::= with insert_cmd(R) INTO fullname(X) inscollist_opt(F) DEFAULT VALUES.
            {sqlite3Insert(pParse, X, 0, F, R);}

%type insert_cmd {u8}
insert_cmd(A) ::= INSERT orconf(R).   {A = R;}
insert_cmd(A) ::= REPLACE.            {A = OE_Replace;}

%type inscollist_opt {IdList*}
................................................................................
                                        {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) PLUS|MINUS(OP) expr(Y).
                                        {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) STAR|SLASH|REM(OP) expr(Y).
                                        {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
expr(A) ::= expr(X) CONCAT(OP) expr(Y). {spanBinaryExpr(&A,pParse,@OP,&X,&Y);}
%type likeop {struct LikeOp}
likeop(A) ::= LIKE_KW|MATCH(X).     {A.eOperator = X; A.bNot = 0;}
likeop(A) ::= NOT LIKE_KW|MATCH(X). {A.eOperator = X; A.bNot = 1;}


expr(A) ::= expr(X) likeop(OP) expr(Y).  [LIKE_KW]  {
  ExprList *pList;
  pList = sqlite3ExprListAppend(pParse,0, Y.pExpr);
  pList = sqlite3ExprListAppend(pParse,pList, X.pExpr);
  A.pExpr = sqlite3ExprFunction(pParse, pList, &OP.eOperator);
  if( OP.bNot ) A.pExpr = sqlite3PExpr(pParse, TK_NOT, A.pExpr, 0, 0);
  A.zStart = X.zStart;
................................................................................
vtabargtoken ::= ANY(X).            {sqlite3VtabArgExtend(pParse,&X);}
vtabargtoken ::= lp anylist RP(X).  {sqlite3VtabArgExtend(pParse,&X);}
lp ::= LP(X).                       {sqlite3VtabArgExtend(pParse,&X);}
anylist ::= .
anylist ::= anylist LP anylist RP.
anylist ::= anylist ANY.
%endif  SQLITE_OMIT_VIRTUALTABLE


//////////////////////// COMMON TABLE EXPRESSIONS ////////////////////////////
with ::= .
%ifndef SQLITE_OMIT_CTE
with ::= WITH wqlist.              {sqlite3CteFinish(pParse, 0);}
with ::= WITH RECURSIVE wqlist.    {sqlite3CteFinish(pParse, 1);}
wqlist ::= with_query.
wqlist ::= wqlist COMMA with_query.
with_query ::= nm(X) idxlist_opt(Y) AS LP select(Z) RP. {
  sqlite3CteAdd(pParse, &X, Y, Z);
}
%endif  SQLITE_OMIT_CTE

Changes to src/sqliteInt.h. 

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CollSeq *sqlite3BinaryCompareCollSeq(Parse *, Expr *, Expr *);
int sqlite3TempInMemory(const sqlite3*);
const char *sqlite3JournalModename(int);
#ifndef SQLITE_OMIT_WAL
  int sqlite3Checkpoint(sqlite3*, int, int, int*, int*);
  int sqlite3WalDefaultHook(void*,sqlite3*,const char*,int);
#endif





/* Declarations for functions in fkey.c. All of these are replaced by
** no-op macros if OMIT_FOREIGN_KEY is defined. In this case no foreign
** key functionality is available. If OMIT_TRIGGER is defined but
** OMIT_FOREIGN_KEY is not, only some of the functions are no-oped. In
** this case foreign keys are parsed, but no other functionality is 
** provided (enforcement of FK constraints requires the triggers sub-system).








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CollSeq *sqlite3BinaryCompareCollSeq(Parse *, Expr *, Expr *);
int sqlite3TempInMemory(const sqlite3*);
const char *sqlite3JournalModename(int);
#ifndef SQLITE_OMIT_WAL
  int sqlite3Checkpoint(sqlite3*, int, int, int*, int*);
  int sqlite3WalDefaultHook(void*,sqlite3*,const char*,int);
#endif
#ifndef SQLITE_OMIT_CTE
  void sqlite3CteAdd(Parse*,Token*,ExprList*,Select*);
  void sqlite3CteFinish(Parse*,int);
#endif

/* Declarations for functions in fkey.c. All of these are replaced by
** no-op macros if OMIT_FOREIGN_KEY is defined. In this case no foreign
** key functionality is available. If OMIT_TRIGGER is defined but
** OMIT_FOREIGN_KEY is not, only some of the functions are no-oped. In
** this case foreign keys are parsed, but no other functionality is 
** provided (enforcement of FK constraints requires the triggers sub-system).

Changes to tool/mkkeywordhash.c. 

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#  define VTAB       0x00010000
#endif
#ifdef SQLITE_OMIT_AUTOVACUUM
#  define AUTOVACUUM 0
#else
#  define AUTOVACUUM 0x00020000
#endif






/*
** These are the keywords
*/
static Keyword aKeywordTable[] = {
  { "ABORT",            "TK_ABORT",        CONFLICT|TRIGGER       },
  { "ACTION",           "TK_ACTION",       FKEY                   },
................................................................................
  { "ORDER",            "TK_ORDER",        ALWAYS                 },
  { "OUTER",            "TK_JOIN_KW",      ALWAYS                 },
  { "PLAN",             "TK_PLAN",         EXPLAIN                },
  { "PRAGMA",           "TK_PRAGMA",       PRAGMA                 },
  { "PRIMARY",          "TK_PRIMARY",      ALWAYS                 },
  { "QUERY",            "TK_QUERY",        EXPLAIN                },
  { "RAISE",            "TK_RAISE",        TRIGGER                },

  { "REFERENCES",       "TK_REFERENCES",   FKEY                   },
  { "REGEXP",           "TK_LIKE_KW",      ALWAYS                 },
  { "REINDEX",          "TK_REINDEX",      REINDEX                },
  { "RELEASE",          "TK_RELEASE",      ALWAYS                 },
  { "RENAME",           "TK_RENAME",       ALTER                  },
  { "REPLACE",          "TK_REPLACE",      CONFLICT               },
  { "RESTRICT",         "TK_RESTRICT",     FKEY                   },
................................................................................
  { "UNIQUE",           "TK_UNIQUE",       ALWAYS                 },
  { "UPDATE",           "TK_UPDATE",       ALWAYS                 },
  { "USING",            "TK_USING",        ALWAYS                 },
  { "VACUUM",           "TK_VACUUM",       VACUUM                 },
  { "VALUES",           "TK_VALUES",       ALWAYS                 },
  { "VIEW",             "TK_VIEW",         VIEW                   },
  { "VIRTUAL",          "TK_VIRTUAL",      VTAB                   },

  { "WITHOUT",          "TK_WITHOUT",      ALWAYS                 },
  { "WHEN",             "TK_WHEN",         ALWAYS                 },
  { "WHERE",            "TK_WHERE",        ALWAYS                 },
};

/* Number of keywords */
static int nKeyword = (sizeof(aKeywordTable)/sizeof(aKeywordTable[0]));








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#  define VTAB       0x00010000
#endif
#ifdef SQLITE_OMIT_AUTOVACUUM
#  define AUTOVACUUM 0
#else
#  define AUTOVACUUM 0x00020000
#endif
#ifdef SQLITE_OMIT_CTE
#  define CTE        0
#else
#  define CTE        0x00040000
#endif

/*
** These are the keywords
*/
static Keyword aKeywordTable[] = {
  { "ABORT",            "TK_ABORT",        CONFLICT|TRIGGER       },
  { "ACTION",           "TK_ACTION",       FKEY                   },
................................................................................
  { "ORDER",            "TK_ORDER",        ALWAYS                 },
  { "OUTER",            "TK_JOIN_KW",      ALWAYS                 },
  { "PLAN",             "TK_PLAN",         EXPLAIN                },
  { "PRAGMA",           "TK_PRAGMA",       PRAGMA                 },
  { "PRIMARY",          "TK_PRIMARY",      ALWAYS                 },
  { "QUERY",            "TK_QUERY",        EXPLAIN                },
  { "RAISE",            "TK_RAISE",        TRIGGER                },
  { "RECURSIVE",        "TK_RECURSIVE",    CTE                    },
  { "REFERENCES",       "TK_REFERENCES",   FKEY                   },
  { "REGEXP",           "TK_LIKE_KW",      ALWAYS                 },
  { "REINDEX",          "TK_REINDEX",      REINDEX                },
  { "RELEASE",          "TK_RELEASE",      ALWAYS                 },
  { "RENAME",           "TK_RENAME",       ALTER                  },
  { "REPLACE",          "TK_REPLACE",      CONFLICT               },
  { "RESTRICT",         "TK_RESTRICT",     FKEY                   },
................................................................................
  { "UNIQUE",           "TK_UNIQUE",       ALWAYS                 },
  { "UPDATE",           "TK_UPDATE",       ALWAYS                 },
  { "USING",            "TK_USING",        ALWAYS                 },
  { "VACUUM",           "TK_VACUUM",       VACUUM                 },
  { "VALUES",           "TK_VALUES",       ALWAYS                 },
  { "VIEW",             "TK_VIEW",         VIEW                   },
  { "VIRTUAL",          "TK_VIRTUAL",      VTAB                   },
  { "WITH",             "TK_WITH",         CTE                    },
  { "WITHOUT",          "TK_WITHOUT",      ALWAYS                 },
  { "WHEN",             "TK_WHEN",         ALWAYS                 },
  { "WHERE",            "TK_WHERE",        ALWAYS                 },
};

/* Number of keywords */
static int nKeyword = (sizeof(aKeywordTable)/sizeof(aKeywordTable[0]));

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