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Changes On Branch flatten-left-join
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Changes In Branch flatten-left-join Excluding Merge-Ins

This is equivalent to a diff from 217fc3ebd4 to 2909f36bfb

2022-07-26
18:43
Fix another problem related to aggregate query LEFT JOIN flattening. (check-in: 8e12c6f59b user: dan tags: trunk)
15:41
Omit a unused variable initialization in order to suppress a harmless compiler warning. (check-in: 2d703c5e94 user: drh tags: trunk)
15:39
Add test cases related to fix [e717e029]. (Closed-Leaf check-in: 2909f36bfb user: dan tags: flatten-left-join)
15:32
Make sure IF_NULL_ROW expressions receive a separate slot in the sorter used to implement GROUP BY. (check-in: 2bda4fca06 user: drh tags: flatten-left-join)
14:37
Improved AggInfo.aCol debugging output, intended to debug a problem with LEFT JOIN flattening into an aggregate query with GROUP BY. (check-in: e717e029bd user: drh tags: flatten-left-join)
10:16
Add a OOM term to a single assert() statement. (check-in: 217fc3ebd4 user: drh tags: trunk)
01:20
Performance optimization: avoid unnecessary calls to computeLimitRegisters(). (check-in: f48bd8f85d user: drh tags: trunk)

Changes to src/expr.c.
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        return pCol->iMem;
      }else if( pAggInfo->useSortingIdx ){
        Table *pTab = pCol->pTab;
        sqlite3VdbeAddOp3(v, OP_Column, pAggInfo->sortingIdxPTab,
                              pCol->iSorterColumn, target);
        if( pCol->iColumn<0 ){
          VdbeComment((v,"%s.rowid",pTab->zName));
        }else{
        }else if( ALWAYS(pTab!=0) ){
          VdbeComment((v,"%s.%s", 
              pTab->zName, pTab->aCol[pCol->iColumn].zCnName));
          if( pTab->aCol[pCol->iColumn].affinity==SQLITE_AFF_REAL ){
            sqlite3VdbeAddOp1(v, OP_RealAffinity, target);
          }
        }
        return target;
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            **
            ** Make an entry for the column in pAggInfo->aCol[] if there
            ** is not an entry there already.
            */
            int k;
            pCol = pAggInfo->aCol;
            for(k=0; k<pAggInfo->nColumn; k++, pCol++){
              if( pCol->iTable==pExpr->iTable &&
                  pCol->iColumn==pExpr->iColumn ){
              if( pCol->iTable==pExpr->iTable
               && pCol->iColumn==pExpr->iColumn
               && pExpr->op!=TK_IF_NULL_ROW
              ){
                break;
              }
            }
            if( (k>=pAggInfo->nColumn)
             && (k = addAggInfoColumn(pParse->db, pAggInfo))>=0 
            ){
              pCol = &pAggInfo->aCol[k];
              assert( ExprUseYTab(pExpr) );
              pCol->pTab = pExpr->y.pTab;
              pCol->iTable = pExpr->iTable;
              pCol->iColumn = pExpr->iColumn;
              pCol->iMem = ++pParse->nMem;
              pCol->iSorterColumn = -1;
              pCol->pCExpr = pExpr;
              if( pAggInfo->pGroupBy ){
              if( pAggInfo->pGroupBy && pExpr->op!=TK_IF_NULL_ROW ){
                int j, n;
                ExprList *pGB = pAggInfo->pGroupBy;
                struct ExprList_item *pTerm = pGB->a;
                n = pGB->nExpr;
                for(j=0; j<n; j++, pTerm++){
                  Expr *pE = pTerm->pExpr;
                  if( pE->op==TK_COLUMN && pE->iTable==pExpr->iTable &&
                      pE->iColumn==pExpr->iColumn ){
                  if( pE->op==TK_COLUMN
                   && pE->iTable==pExpr->iTable
                   && pE->iColumn==pExpr->iColumn
                  ){
                    pCol->iSorterColumn = j;
                    break;
                  }
                }
              }
              if( pCol->iSorterColumn<0 ){
                pCol->iSorterColumn = pAggInfo->nSortingColumn++;
︙
Changes to src/select.c.
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      }else{
        sqlite3 *db = pSubst->pParse->db;
        if( pSubst->isOuterJoin && pCopy->op!=TK_COLUMN ){
          memset(&ifNullRow, 0, sizeof(ifNullRow));
          ifNullRow.op = TK_IF_NULL_ROW;
          ifNullRow.pLeft = pCopy;
          ifNullRow.iTable = pSubst->iNewTable;
          ifNullRow.iColumn = -99;
          ifNullRow.flags = EP_IfNullRow;
          pCopy = &ifNullRow;
        }
        testcase( ExprHasProperty(pCopy, EP_Subquery) );
        pNew = sqlite3ExprDup(db, pCopy, 0);
        if( db->mallocFailed ){
          sqlite3ExprDelete(db, pNew);
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      SELECTTRACE(0x400,pParse,p,("After aggregate analysis %p:\n", pAggInfo));
      sqlite3TreeViewSelect(0, p, 0);
      if( minMaxFlag ){
        sqlite3DebugPrintf("MIN/MAX Optimization (0x%02x) adds:\n", minMaxFlag);
        sqlite3TreeViewExprList(0, pMinMaxOrderBy, 0, "ORDERBY");
      }
      for(ii=0; ii<pAggInfo->nColumn; ii++){
        struct AggInfo_col *pCol = &pAggInfo->aCol[ii];
        sqlite3DebugPrintf("agg-column[%d] iMem=%d\n",
            ii, pAggInfo->aCol[ii].iMem);
        sqlite3DebugPrintf(
           "agg-column[%d] pTab=%s iTable=%d iColumn=%d iMem=%d"
           " iSorterColumn=%d\n",
           ii, pCol->pTab ? pCol->pTab->zName : "NULL", 
           pCol->iTable, pCol->iColumn, pCol->iMem,
           pCol->iSorterColumn);
        sqlite3TreeViewExpr(0, pAggInfo->aCol[ii].pCExpr, 0);
      }
      for(ii=0; ii<pAggInfo->nFunc; ii++){
        sqlite3DebugPrintf("agg-func[%d]: iMem=%d\n",
            ii, pAggInfo->aFunc[ii].iMem);
        sqlite3TreeViewExpr(0, pAggInfo->aFunc[ii].pFExpr, 0);
      }
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Changes to test/select3.test.
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    INSERT INTO t2 VALUES(1234);
    SELECT max(a), val FROM t1 LEFT JOIN (
        SELECT 'constant' AS val FROM t2 WHERE x=1234
    )
  } {abc constant}
}

reset_db
do_execsql_test 12.0 {
  CREATE TABLE t1(a);
  CREATE TABLE t2(x);

}
do_execsql_test 12.1 {
  SELECT count(x), m FROM t1 LEFT JOIN (SELECT x, 59 AS m FROM t2) GROUP BY a;
}
do_execsql_test 12.2 {
  INSERT INTO t1 VALUES(1), (1), (2), (3);
  SELECT count(x), m FROM t1 LEFT JOIN (SELECT x, 59 AS m FROM t2) GROUP BY a;
} {
  0 {}
  0 {}
  0 {}
}
do_execsql_test 12.3 {
  INSERT INTO t2 VALUES(45);
  SELECT count(x), m FROM t1 LEFT JOIN (SELECT x, 59 AS m FROM t2) GROUP BY a;
} {
  2 59
  1 59
  1 59
}
do_execsql_test 12.4 {
  INSERT INTO t2 VALUES(210);
  SELECT count(x), m FROM t1 LEFT JOIN (SELECT x, 59 AS m FROM t2) GROUP BY a;
} {
  4 59
  2 59
  2 59
}
do_execsql_test 12.5 {
  INSERT INTO t2 VALUES(NULL);
  SELECT count(x), m FROM t1 LEFT JOIN (SELECT x, 59 AS m FROM t2) GROUP BY a;
} {
  4 59
  2 59
  2 59
}
do_execsql_test 12.6 {
  DELETE FROM t2;
  DELETE FROM t1;
  INSERT INTO t1 VALUES('value');
  INSERT INTO t2 VALUES('hello');
} {}
do_execsql_test 12.7 {
  SELECT group_concat(x), m FROM t1 
    LEFT JOIN (SELECT x, 59 AS m FROM t2) GROUP BY a;
} {
  hello 59
}
do_execsql_test 12.8 {
  SELECT group_concat(x), m, n FROM t1 
    LEFT JOIN (SELECT x, 59 AS m, 60 AS n FROM t2) GROUP BY a;
} {
  hello 59 60
}

finish_test