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Latest round of changes for SQL query optimization.

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git-svn-id: https://svn.code.sf.net/p/flaim/code/trunk@709 0109f412-320b-0410-ab79-c3e0c5ffbbe6
This commit is contained in:
dsandersoremutah
2006-07-25 22:40:53 +00:00
parent 33e39a5d44
commit a7e6b942f8
20 changed files with 1435 additions and 476 deletions
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103
sql/src/select.cpp
View File

@@ -154,6 +154,7 @@ RCODE SQLStatement::processSelect( void)
FLMUINT uiTokenLen;
FLMBOOL bDistinct;
F_TABLE * pTable;
F_INDEX * pIndex;
SELECT_EXPR * pFirstSelectExpr = NULL;
SELECT_EXPR * pLastSelectExpr = NULL;
SELECT_EXPR * pSelectExpr;
@@ -258,6 +259,8 @@ RCODE SQLStatement::processSelect( void)
// Add the table name to the list
tableList [uiNumTables].bScan = FALSE;
tableList [uiNumTables].uiIndexNum = 0;
tableList [uiNumTables].uiTableNum = pTable->uiTableNum;
tableList [uiNumTables].pszTableAlias = NULL;
uiNumTables++;
@@ -285,9 +288,59 @@ RCODE SQLStatement::processSelect( void)
bHaveOrderBy = TRUE;
break;
}
else if (f_stricmp( szToken, "using") == 0)
{
Get_Index:
if (RC_BAD( rc = getToken( szToken, sizeof( szToken), FALSE,
&uiTokenLineOffset, &uiTokenLen)))
{
goto Exit;
}
if (f_stricmp( szToken, "noindex") == 0)
{
tableList [uiNumTables - 1].bScan = TRUE;
tableList [uiNumTables - 1].uiIndexNum = 0;
}
else if (f_stricmp( szToken, "index") == 0)
{
// Get the index name.
if (RC_BAD( rc = getIndexName( TRUE, pTable, szToken, sizeof( szToken),
&uiTokenLen, &pIndex)))
{
goto Exit;
}
tableList [uiNumTables - 1].bScan = FALSE;
tableList [uiNumTables - 1].uiIndexNum = pIndex->uiIndexNum;
}
else
{
setErrInfo( m_uiCurrLineNum,
uiTokenLineOffset,
SQL_ERR_EXPECTING_INDEX_OR_NOINDEX,
m_uiCurrLineFilePos,
m_uiCurrLineBytes);
rc = RC_SET( NE_SFLM_INVALID_SQL);
goto Exit;
}
}
else if ((szToken [0] >= 'a' && szToken [0] <= 'z') ||
(szToken [0] >= 'A' && szToken [0] <= 'Z'))
{
// If token is the keyword "as", it must be followed by the
// alias name.
if (f_stricmp( szToken, "as") == 0)
{
if (RC_BAD( rc = getName( szToken, sizeof( szToken),
&uiTokenLen, &uiTokenLineOffset)))
{
goto Exit;
}
}
// See if this alias name has been used in the table list already.
for (uiLoop = 0; uiLoop < uiNumTables; uiLoop++)
@@ -315,7 +368,40 @@ RCODE SQLStatement::processSelect( void)
}
f_memcpy( &tableList [uiNumTables - 1].pszTableAlias, szToken,
uiTokenLen + 1);
if (RC_BAD( rc = getToken( szToken, sizeof( szToken), TRUE,
&uiTokenLineOffset, &uiTokenLen)))
{
if (rc == NE_SFLM_EOF_HIT)
{
rc = NE_SFLM_OK;
break;
}
goto Exit;
}
if (f_stricmp( szToken, "where") == 0)
{
bHaveWhere = TRUE;
break;
}
else if (f_stricmp( szToken, "order") == 0)
{
bHaveOrderBy = TRUE;
break;
}
else if (f_stricmp( szToken, "using") == 0)
{
goto Get_Index;
}
else if (f_stricmp( szToken, ",") != 0)
{
setErrInfo( m_uiCurrLineNum,
uiTokenLineOffset,
SQL_ERR_EXPECTING_COMMA,
m_uiCurrLineFilePos,
m_uiCurrLineBytes);
rc = RC_SET( NE_SFLM_INVALID_SQL);
goto Exit;
}
}
else if (f_stricmp( szToken, ",") != 0)
{
@@ -353,6 +439,21 @@ RCODE SQLStatement::processSelect( void)
{
goto Exit;
}
if (tableList [uiLoop].bScan)
{
if (RC_BAD( rc = sqlQuery.setIndex( tableList [uiLoop].uiTableNum, 0)))
{
goto Exit;
}
}
else if (tableList [uiLoop].uiIndexNum)
{
if (RC_BAD( rc = sqlQuery.setIndex( tableList [uiLoop].uiTableNum,
tableList [uiLoop].uiIndexNum)))
{
goto Exit;
}
}
}
// If there is a WHERE clause, parse it.