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Comment:Resolve names in FROM-clause subqueries prior to resolving names in the result set expressions of a SELECT statement.
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SHA1:9b67c633d932f3e566f521ee6a9cf3be193436fa
User & Date: drh 2012-12-18 16:07:08
Context
2012-12-18
19:36
Optimize the degenerate case of a FROM clause table name enclosed all by itself inside parentheses. Generate code as if the parentheses did not exist, rather than the old behavior of manifesting the parenthesized table into a transient table. Also, tag every FROM-clause SELECT subquery that is generated by a parenthesized FROM-clause expression using the SF_NestedFrom flag. The new SF_NestedFrom flag is not yet used for anything. check-in: 7fecced4 user: drh tags: trunk
16:07
Resolve names in FROM-clause subqueries prior to resolving names in the result set expressions of a SELECT statement. check-in: 9b67c633 user: drh tags: trunk
13:12
Remove old commented-out code from parse.y. Fix some over-length source lines in parse.y. No logical changes. check-in: 7e30c021 user: drh tags: trunk
Changes
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Changes to src/resolve.c. 

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    memset(&sNC, 0, sizeof(sNC));
    sNC.pParse = pParse;
    if( sqlite3ResolveExprNames(&sNC, p->pLimit) ||
        sqlite3ResolveExprNames(&sNC, p->pOffset) ){
      return WRC_Abort;
    }
  
    /* Set up the local name-context to pass to sqlite3ResolveExprNames() to
    ** resolve the result-set expression list.
    */
    sNC.ncFlags = NC_AllowAgg;
    sNC.pSrcList = p->pSrc;
    sNC.pNext = pOuterNC;
  
    /* Resolve names in the result set. */
    pEList = p->pEList;
    assert( pEList!=0 );
    for(i=0; i<pEList->nExpr; i++){
      Expr *pX = pEList->a[i].pExpr;
      if( sqlite3ResolveExprNames(&sNC, pX) ){
        return WRC_Abort;
      }
    }
  
    /* Recursively resolve names in all subqueries
    */
    for(i=0; i<p->pSrc->nSrc; i++){
      struct SrcList_item *pItem = &p->pSrc->a[i];
      if( pItem->pSelect ){
        NameContext *pNC;         /* Used to iterate name contexts */
        int nRef = 0;             /* Refcount for pOuterNC and outer contexts */
................................................................................
        if( pParse->nErr || db->mallocFailed ) return WRC_Abort;

        for(pNC=pOuterNC; pNC; pNC=pNC->pNext) nRef -= pNC->nRef;
        assert( pItem->isCorrelated==0 && nRef<=0 );
        pItem->isCorrelated = (nRef!=0);
      }
    }

















  
    /* If there are no aggregate functions in the result-set, and no GROUP BY 
    ** expression, do not allow aggregates in any of the other expressions.
    */
    assert( (p->selFlags & SF_Aggregate)==0 );
    pGroupBy = p->pGroupBy;
    if( pGroupBy || (sNC.ncFlags & NC_HasAgg)!=0 ){








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    memset(&sNC, 0, sizeof(sNC));
    sNC.pParse = pParse;
    if( sqlite3ResolveExprNames(&sNC, p->pLimit) ||
        sqlite3ResolveExprNames(&sNC, p->pOffset) ){
      return WRC_Abort;
    }
  

















    /* Recursively resolve names in all subqueries
    */
    for(i=0; i<p->pSrc->nSrc; i++){
      struct SrcList_item *pItem = &p->pSrc->a[i];
      if( pItem->pSelect ){
        NameContext *pNC;         /* Used to iterate name contexts */
        int nRef = 0;             /* Refcount for pOuterNC and outer contexts */
................................................................................
        if( pParse->nErr || db->mallocFailed ) return WRC_Abort;

        for(pNC=pOuterNC; pNC; pNC=pNC->pNext) nRef -= pNC->nRef;
        assert( pItem->isCorrelated==0 && nRef<=0 );
        pItem->isCorrelated = (nRef!=0);
      }
    }
  
    /* Set up the local name-context to pass to sqlite3ResolveExprNames() to
    ** resolve the result-set expression list.
    */
    sNC.ncFlags = NC_AllowAgg;
    sNC.pSrcList = p->pSrc;
    sNC.pNext = pOuterNC;
  
    /* Resolve names in the result set. */
    pEList = p->pEList;
    assert( pEList!=0 );
    for(i=0; i<pEList->nExpr; i++){
      Expr *pX = pEList->a[i].pExpr;
      if( sqlite3ResolveExprNames(&sNC, pX) ){
        return WRC_Abort;
      }
    }
  
    /* If there are no aggregate functions in the result-set, and no GROUP BY 
    ** expression, do not allow aggregates in any of the other expressions.
    */
    assert( (p->selFlags & SF_Aggregate)==0 );
    pGroupBy = p->pGroupBy;
    if( pGroupBy || (sNC.ncFlags & NC_HasAgg)!=0 ){

Changes to test/auth2.test. 

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do_test auth2-2.3 {
  set ::authargs {}
  db eval {
    SELECT a, b FROM v2;
  }
  set ::authargs
} {SQLITE_SELECT {} {} {} {}
SQLITE_READ v2 a main {}
SQLITE_READ v2 b main {}
SQLITE_READ t2 x main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 z main v2


SQLITE_SELECT {} {} {} v2
}
do_test auth2-2.4 {
  db2 eval {
    CREATE TABLE t3(p,q,r);
  }
  set ::authargs {}
  db eval {
    SELECT b, a FROM v2;
  }
  set ::authargs
} {SQLITE_SELECT {} {} {} {}
SQLITE_READ v2 b main {}
SQLITE_READ v2 a main {}
SQLITE_READ t2 x main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 z main v2
SQLITE_SELECT {} {} {} v2
SQLITE_SELECT {} {} {} {}
SQLITE_READ v2 b main {}
SQLITE_READ v2 a main {}


SQLITE_READ t2 x main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 z main v2


SQLITE_SELECT {} {} {} v2
}
db2 close

finish_test








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do_test auth2-2.3 {
  set ::authargs {}
  db eval {
    SELECT a, b FROM v2;
  }
  set ::authargs
} {SQLITE_SELECT {} {} {} {}


SQLITE_READ t2 x main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 z main v2
SQLITE_READ v2 a main {}
SQLITE_READ v2 b main {}
SQLITE_SELECT {} {} {} v2
}
do_test auth2-2.4 {
  db2 eval {
    CREATE TABLE t3(p,q,r);
  }
  set ::authargs {}
  db eval {
    SELECT b, a FROM v2;
  }
  set ::authargs
} {SQLITE_SELECT {} {} {} {}


SQLITE_READ t2 x main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 z main v2


SQLITE_READ v2 b main {}
SQLITE_READ v2 a main {}
SQLITE_SELECT {} {} {} v2
SQLITE_SELECT {} {} {} {}
SQLITE_READ t2 x main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 y main v2
SQLITE_READ t2 z main v2
SQLITE_READ v2 b main {}
SQLITE_READ v2 a main {}
SQLITE_SELECT {} {} {} v2
}
db2 close

finish_test

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