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ogr_gensql.cpp
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/******************************************************************************
*
* Project: OpenGIS Simple Features Reference Implementation
* Purpose: Implements OGRGenSQLResultsLayer.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2002, Frank Warmerdam
* Copyright (c) 2008-2014, Even Rouault <even dot rouault at spatialys.com>
*
* SPDX-License-Identifier: MIT
****************************************************************************/
#include "ogr_swq.h"
#include "ogr_p.h"
#include "ogr_gensql.h"
#include "cpl_string.h"
#include "ogr_api.h"
#include "ogr_recordbatch.h"
#include "ogrlayerarrow.h"
#include "cpl_time.h"
#include <algorithm>
#include <limits>
#include <map>
#include <set>
#include <vector>
//! @cond Doxygen_Suppress
extern const swq_field_type SpecialFieldTypes[SPECIAL_FIELD_COUNT];
class OGRGenSQLGeomFieldDefn final : public OGRGeomFieldDefn
{
public:
explicit OGRGenSQLGeomFieldDefn(OGRGeomFieldDefn *poGeomFieldDefn)
: OGRGeomFieldDefn(poGeomFieldDefn->GetNameRef(),
poGeomFieldDefn->GetType()),
bForceGeomType(FALSE)
{
SetSpatialRef(poGeomFieldDefn->GetSpatialRef());
}
int bForceGeomType;
};
/************************************************************************/
/* OGRGenSQLResultsLayerHasSpecialField() */
/************************************************************************/
static bool OGRGenSQLResultsLayerHasSpecialField(swq_expr_node *expr,
int nMinIndexForSpecialField)
{
if (expr->eNodeType == SNT_COLUMN)
{
if (expr->table_index == 0)
{
return expr->field_index >= nMinIndexForSpecialField &&
expr->field_index <
nMinIndexForSpecialField + SPECIAL_FIELD_COUNT;
}
}
else if (expr->eNodeType == SNT_OPERATION)
{
for (int i = 0; i < expr->nSubExprCount; i++)
{
if (OGRGenSQLResultsLayerHasSpecialField(expr->papoSubExpr[i],
nMinIndexForSpecialField))
return true;
}
}
return false;
}
/************************************************************************/
/* OGRGenSQLResultsLayer() */
/************************************************************************/
OGRGenSQLResultsLayer::OGRGenSQLResultsLayer(
GDALDataset *poSrcDSIn, std::unique_ptr<swq_select> &&pSelectInfo,
const OGRGeometry *poSpatFilter, const char *pszWHEREIn,
const char *pszDialect)
: m_poSrcDS(poSrcDSIn), m_pSelectInfo(std::move(pSelectInfo))
{
swq_select *psSelectInfo = m_pSelectInfo.get();
/* -------------------------------------------------------------------- */
/* Identify all the layers involved in the SELECT. */
/* -------------------------------------------------------------------- */
m_apoTableLayers.reserve(psSelectInfo->table_count);
for (int iTable = 0; iTable < psSelectInfo->table_count; iTable++)
{
swq_table_def *psTableDef = psSelectInfo->table_defs + iTable;
GDALDataset *poTableDS = m_poSrcDS;
if (psTableDef->data_source != nullptr)
{
std::unique_ptr<GDALDataset, GDALDatasetUniquePtrReleaser> poNewDS(
GDALDataset::Open(psTableDef->data_source,
GDAL_OF_VECTOR | GDAL_OF_SHARED));
if (!poNewDS)
{
if (strlen(CPLGetLastErrorMsg()) == 0)
CPLError(CE_Failure, CPLE_AppDefined,
"Unable to open secondary datasource\n"
"`%s' required by JOIN.",
psTableDef->data_source);
return;
}
m_apoExtraDS.emplace_back(std::move(poNewDS));
poTableDS = m_apoExtraDS.back().get();
}
m_apoTableLayers.push_back(
poTableDS->GetLayerByName(psTableDef->table_name));
if (!m_apoTableLayers.back())
return;
}
m_poSrcLayer = m_apoTableLayers[0];
SetMetadata(m_poSrcLayer->GetMetadata("NATIVE_DATA"), "NATIVE_DATA");
/* -------------------------------------------------------------------- */
/* If the user has explicitly requested a OGRSQL dialect, then */
/* we should avoid to forward the where clause to the source layer */
/* when there is a risk it cannot understand it (#4022) */
/* -------------------------------------------------------------------- */
m_bForwardWhereToSourceLayer = true;
if (pszWHEREIn)
{
if (psSelectInfo->where_expr && pszDialect != nullptr &&
EQUAL(pszDialect, "OGRSQL"))
{
const int nMinIndexForSpecialField =
m_poSrcLayer->GetLayerDefn()->GetFieldCount();
m_bForwardWhereToSourceLayer =
!OGRGenSQLResultsLayerHasSpecialField(psSelectInfo->where_expr,
nMinIndexForSpecialField);
}
m_osInitialWHERE = pszWHEREIn;
}
/* -------------------------------------------------------------------- */
/* Prepare a feature definition based on the query. */
/* -------------------------------------------------------------------- */
OGRFeatureDefn *poSrcDefn = m_poSrcLayer->GetLayerDefn();
m_poDefn = new OGRFeatureDefn(psSelectInfo->table_defs[0].table_alias);
SetDescription(m_poDefn->GetName());
m_poDefn->SetGeomType(wkbNone);
m_poDefn->Reference();
m_iFIDFieldIndex = poSrcDefn->GetFieldCount();
for (std::size_t iField = 0; iField < psSelectInfo->column_defs.size();
iField++)
{
swq_col_def *psColDef = &psSelectInfo->column_defs[iField];
OGRFieldDefn oFDefn("", OFTInteger);
OGRGeomFieldDefn oGFDefn("", wkbUnknown);
OGRFieldDefn *poSrcFDefn = nullptr;
OGRGeomFieldDefn *poSrcGFDefn = nullptr;
int bIsGeometry = FALSE;
OGRFeatureDefn *poLayerDefn = nullptr;
int iSrcGeomField = -1;
if (psColDef->bHidden)
continue;
if (psColDef->table_index != -1)
poLayerDefn =
m_apoTableLayers[psColDef->table_index]->GetLayerDefn();
if (psColDef->field_index > -1 && poLayerDefn != nullptr &&
psColDef->field_index < poLayerDefn->GetFieldCount())
{
poSrcFDefn = poLayerDefn->GetFieldDefn(psColDef->field_index);
}
if (poLayerDefn != nullptr &&
IS_GEOM_FIELD_INDEX(poLayerDefn, psColDef->field_index))
{
bIsGeometry = TRUE;
iSrcGeomField = ALL_FIELD_INDEX_TO_GEOM_FIELD_INDEX(
poLayerDefn, psColDef->field_index);
poSrcGFDefn = poLayerDefn->GetGeomFieldDefn(iSrcGeomField);
}
if (psColDef->target_type == SWQ_GEOMETRY)
bIsGeometry = TRUE;
if (psColDef->col_func == SWQCF_COUNT)
bIsGeometry = FALSE;
if (strlen(psColDef->field_name) == 0 && !bIsGeometry)
{
CPLFree(psColDef->field_name);
psColDef->field_name = static_cast<char *>(CPLMalloc(40));
snprintf(psColDef->field_name, 40, "FIELD_%d",
m_poDefn->GetFieldCount() + 1);
}
if (psColDef->field_alias != nullptr)
{
if (bIsGeometry)
oGFDefn.SetName(psColDef->field_alias);
else
oFDefn.SetName(psColDef->field_alias);
}
else if (psColDef->col_func != SWQCF_NONE)
{
const swq_operation *op = swq_op_registrar::GetOperator(
static_cast<swq_op>(psColDef->col_func));
oFDefn.SetName(
CPLSPrintf("%s_%s", op->pszName, psColDef->field_name));
}
else
{
CPLString osName;
if (psColDef->table_name[0])
{
osName = psColDef->table_name;
osName += ".";
}
osName += psColDef->field_name;
if (bIsGeometry)
oGFDefn.SetName(osName);
else
oFDefn.SetName(osName);
}
if (psColDef->col_func == SWQCF_COUNT)
oFDefn.SetType(OFTInteger64);
else if (poSrcFDefn != nullptr)
{
if (psColDef->col_func == SWQCF_STDDEV_POP ||
psColDef->col_func == SWQCF_STDDEV_SAMP)
{
oFDefn.SetType(OFTReal);
}
else if (psColDef->col_func != SWQCF_AVG ||
psColDef->field_type == SWQ_DATE ||
psColDef->field_type == SWQ_TIME ||
psColDef->field_type == SWQ_TIMESTAMP)
{
oFDefn.SetType(poSrcFDefn->GetType());
if (psColDef->col_func == SWQCF_NONE ||
psColDef->col_func == SWQCF_MIN ||
psColDef->col_func == SWQCF_MAX)
{
oFDefn.SetSubType(poSrcFDefn->GetSubType());
}
}
else
{
oFDefn.SetType(OFTReal);
}
if (psColDef->col_func != SWQCF_AVG &&
psColDef->col_func != SWQCF_STDDEV_POP &&
psColDef->col_func != SWQCF_STDDEV_SAMP &&
psColDef->col_func != SWQCF_SUM)
{
oFDefn.SetWidth(poSrcFDefn->GetWidth());
oFDefn.SetPrecision(poSrcFDefn->GetPrecision());
}
if (psColDef->col_func == SWQCF_NONE)
oFDefn.SetDomainName(poSrcFDefn->GetDomainName());
}
else if (poSrcGFDefn != nullptr)
{
oGFDefn.SetType(poSrcGFDefn->GetType());
oGFDefn.SetSpatialRef(poSrcGFDefn->GetSpatialRef());
}
else if (psColDef->field_index >= m_iFIDFieldIndex)
{
switch (SpecialFieldTypes[psColDef->field_index - m_iFIDFieldIndex])
{
case SWQ_INTEGER:
oFDefn.SetType(OFTInteger);
break;
case SWQ_INTEGER64:
oFDefn.SetType(OFTInteger64);
break;
case SWQ_FLOAT:
oFDefn.SetType(OFTReal);
break;
default:
oFDefn.SetType(OFTString);
break;
}
if (psColDef->field_index - m_iFIDFieldIndex == SPF_FID &&
m_poSrcLayer->GetMetadataItem(OLMD_FID64) != nullptr &&
EQUAL(m_poSrcLayer->GetMetadataItem(OLMD_FID64), "YES"))
{
oFDefn.SetType(OFTInteger64);
}
}
else
{
switch (psColDef->field_type)
{
case SWQ_INTEGER:
oFDefn.SetType(OFTInteger);
break;
case SWQ_INTEGER64:
oFDefn.SetType(OFTInteger64);
break;
case SWQ_BOOLEAN:
oFDefn.SetType(OFTInteger);
oFDefn.SetSubType(OFSTBoolean);
break;
case SWQ_FLOAT:
oFDefn.SetType(OFTReal);
break;
default:
oFDefn.SetType(OFTString);
break;
}
}
/* setting up the target_type */
switch (psColDef->target_type)
{
case SWQ_OTHER:
break;
case SWQ_INTEGER:
oFDefn.SetType(OFTInteger);
break;
case SWQ_INTEGER64:
oFDefn.SetType(OFTInteger64);
break;
case SWQ_BOOLEAN:
oFDefn.SetType(OFTInteger);
oFDefn.SetSubType(OFSTBoolean);
break;
case SWQ_FLOAT:
oFDefn.SetType(OFTReal);
break;
case SWQ_STRING:
oFDefn.SetType(OFTString);
break;
case SWQ_TIMESTAMP:
oFDefn.SetType(OFTDateTime);
break;
case SWQ_DATE:
oFDefn.SetType(OFTDate);
break;
case SWQ_TIME:
oFDefn.SetType(OFTTime);
break;
case SWQ_GEOMETRY:
break;
default:
CPLAssert(false);
oFDefn.SetType(OFTString);
break;
}
if (psColDef->target_subtype != OFSTNone)
oFDefn.SetSubType(psColDef->target_subtype);
if (psColDef->field_length > 0)
{
oFDefn.SetWidth(psColDef->field_length);
}
if (psColDef->field_precision >= 0)
{
oFDefn.SetPrecision(psColDef->field_precision);
}
if (bIsGeometry)
{
m_anGeomFieldToSrcGeomField.push_back(iSrcGeomField);
/* Hack while drivers haven't been updated so that */
/* poSrcDefn->GetGeomFieldDefn(0)->GetSpatialRef() ==
* m_poSrcLayer->GetSpatialRef() */
if (iSrcGeomField == 0 && poSrcDefn->GetGeomFieldCount() == 1 &&
oGFDefn.GetSpatialRef() == nullptr)
{
oGFDefn.SetSpatialRef(m_poSrcLayer->GetSpatialRef());
}
int bForceGeomType = FALSE;
if (psColDef->eGeomType != wkbUnknown)
{
oGFDefn.SetType(psColDef->eGeomType);
bForceGeomType = TRUE;
}
if (psColDef->nSRID > 0)
{
OGRSpatialReference *poSRS = new OGRSpatialReference();
poSRS->SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER);
if (poSRS->importFromEPSG(psColDef->nSRID) == OGRERR_NONE)
{
oGFDefn.SetSpatialRef(poSRS);
}
poSRS->Release();
}
auto poMyGeomFieldDefn =
std::make_unique<OGRGenSQLGeomFieldDefn>(&oGFDefn);
poMyGeomFieldDefn->bForceGeomType = bForceGeomType;
m_poDefn->AddGeomFieldDefn(std::move(poMyGeomFieldDefn));
}
else
m_poDefn->AddFieldDefn(&oFDefn);
}
/* -------------------------------------------------------------------- */
/* Add implicit geometry field. */
/* -------------------------------------------------------------------- */
if (psSelectInfo->query_mode == SWQM_RECORDSET &&
m_poDefn->GetGeomFieldCount() == 0 &&
poSrcDefn->GetGeomFieldCount() == 1 && !psSelectInfo->bExcludedGeometry)
{
psSelectInfo->column_defs.emplace_back();
swq_col_def *col_def = &psSelectInfo->column_defs.back();
memset(col_def, 0, sizeof(swq_col_def));
const char *pszName = poSrcDefn->GetGeomFieldDefn(0)->GetNameRef();
if (*pszName != '\0')
col_def->field_name = CPLStrdup(pszName);
else
col_def->field_name =
CPLStrdup(OGR_GEOMETRY_DEFAULT_NON_EMPTY_NAME);
col_def->field_alias = nullptr;
col_def->table_index = 0;
col_def->field_index =
GEOM_FIELD_INDEX_TO_ALL_FIELD_INDEX(poSrcDefn, 0);
col_def->field_type = SWQ_GEOMETRY;
col_def->target_type = SWQ_GEOMETRY;
m_anGeomFieldToSrcGeomField.push_back(0);
m_poDefn->AddGeomFieldDefn(std::make_unique<OGRGenSQLGeomFieldDefn>(
poSrcDefn->GetGeomFieldDefn(0)));
/* Hack while drivers haven't been updated so that */
/* poSrcDefn->GetGeomFieldDefn(0)->GetSpatialRef() ==
* m_poSrcLayer->GetSpatialRef() */
if (poSrcDefn->GetGeomFieldDefn(0)->GetSpatialRef() == nullptr)
{
m_poDefn->GetGeomFieldDefn(0)->SetSpatialRef(
m_poSrcLayer->GetSpatialRef());
}
}
/* -------------------------------------------------------------------- */
/* Now that we have m_poSrcLayer, we can install a spatial filter */
/* if there is one. */
/* -------------------------------------------------------------------- */
if (poSpatFilter)
OGRGenSQLResultsLayer::SetSpatialFilter(
0, const_cast<OGRGeometry *>(poSpatFilter));
OGRGenSQLResultsLayer::ResetReading();
FindAndSetIgnoredFields();
if (!m_bForwardWhereToSourceLayer)
OGRLayer::SetAttributeFilter(m_osInitialWHERE.c_str());
}
/************************************************************************/
/* ~OGRGenSQLResultsLayer() */
/************************************************************************/
OGRGenSQLResultsLayer::~OGRGenSQLResultsLayer()
{
if (m_nFeaturesRead > 0 && m_poDefn != nullptr)
{
CPLDebug("GenSQL", CPL_FRMT_GIB " features read on layer '%s'.",
m_nFeaturesRead, m_poDefn->GetName());
}
OGRGenSQLResultsLayer::ClearFilters();
if (m_poDefn != nullptr)
{
m_poDefn->Release();
}
}
/************************************************************************/
/* ClearFilters() */
/* */
/* Clear up all filters currently in place on the target layer, */
/* and joined layers. We try not to leave them installed */
/* except when actively fetching features. */
/************************************************************************/
void OGRGenSQLResultsLayer::ClearFilters()
{
/* -------------------------------------------------------------------- */
/* Clear any filters installed on the target layer. */
/* -------------------------------------------------------------------- */
if (m_poSrcLayer != nullptr)
{
m_poSrcLayer->ResetReading();
m_poSrcLayer->SetAttributeFilter("");
m_poSrcLayer->SetSpatialFilter(nullptr);
}
/* -------------------------------------------------------------------- */
/* Clear any attribute filter installed on the joined layers. */
/* -------------------------------------------------------------------- */
swq_select *psSelectInfo = m_pSelectInfo.get();
if (psSelectInfo != nullptr)
{
for (int iJoin = 0; iJoin < psSelectInfo->join_count; iJoin++)
{
swq_join_def *psJoinInfo = psSelectInfo->join_defs + iJoin;
OGRLayer *poJoinLayer =
m_apoTableLayers[psJoinInfo->secondary_table];
poJoinLayer->SetAttributeFilter("");
}
}
/* -------------------------------------------------------------------- */
/* Clear any ignored field lists installed on source layers */
/* -------------------------------------------------------------------- */
if (psSelectInfo != nullptr)
{
for (int iTable = 0; iTable < psSelectInfo->table_count; iTable++)
{
OGRLayer *poLayer = m_apoTableLayers[iTable];
poLayer->SetIgnoredFields(nullptr);
}
}
}
/************************************************************************/
/* MustEvaluateSpatialFilterOnGenSQL() */
/************************************************************************/
int OGRGenSQLResultsLayer::MustEvaluateSpatialFilterOnGenSQL()
{
int bEvaluateSpatialFilter = FALSE;
if (m_poFilterGeom != nullptr && m_iGeomFieldFilter >= 0 &&
m_iGeomFieldFilter < GetLayerDefn()->GetGeomFieldCount())
{
int iSrcGeomField = m_anGeomFieldToSrcGeomField[m_iGeomFieldFilter];
if (iSrcGeomField < 0)
bEvaluateSpatialFilter = TRUE;
}
return bEvaluateSpatialFilter;
}
/************************************************************************/
/* ApplyFiltersToSource() */
/************************************************************************/
void OGRGenSQLResultsLayer::ApplyFiltersToSource()
{
if (m_bForwardWhereToSourceLayer && !m_osInitialWHERE.empty())
{
m_poSrcLayer->SetAttributeFilter(m_osInitialWHERE.c_str());
}
else
{
m_poSrcLayer->SetAttributeFilter(nullptr);
}
if (m_iGeomFieldFilter >= 0 &&
m_iGeomFieldFilter < GetLayerDefn()->GetGeomFieldCount())
{
int iSrcGeomField = m_anGeomFieldToSrcGeomField[m_iGeomFieldFilter];
if (iSrcGeomField >= 0)
m_poSrcLayer->SetSpatialFilter(iSrcGeomField, m_poFilterGeom);
}
m_poSrcLayer->ResetReading();
}
/************************************************************************/
/* ResetReading() */
/************************************************************************/
void OGRGenSQLResultsLayer::ResetReading()
{
swq_select *psSelectInfo = m_pSelectInfo.get();
if (psSelectInfo->query_mode == SWQM_RECORDSET)
{
ApplyFiltersToSource();
}
m_nNextIndexFID = psSelectInfo->offset;
m_nIteratedFeatures = -1;
m_bEOF = false;
}
/************************************************************************/
/* SetNextByIndex() */
/* */
/* If we already have an FID list, we can easily reposition */
/* ourselves in it. */
/************************************************************************/
OGRErr OGRGenSQLResultsLayer::SetNextByIndex(GIntBig nIndex)
{
if (nIndex < 0)
return OGRERR_FAILURE;
swq_select *psSelectInfo = m_pSelectInfo.get();
if (psSelectInfo->limit >= 0)
{
m_nIteratedFeatures = nIndex;
if (m_nIteratedFeatures >= psSelectInfo->limit)
{
return OGRERR_FAILURE;
}
}
CreateOrderByIndex();
if (nIndex > std::numeric_limits<GIntBig>::max() - psSelectInfo->offset)
{
m_bEOF = true;
return OGRERR_FAILURE;
}
if (psSelectInfo->query_mode == SWQM_SUMMARY_RECORD ||
psSelectInfo->query_mode == SWQM_DISTINCT_LIST || !m_anFIDIndex.empty())
{
m_nNextIndexFID = nIndex + psSelectInfo->offset;
return OGRERR_NONE;
}
else
{
OGRErr eErr =
m_poSrcLayer->SetNextByIndex(nIndex + psSelectInfo->offset);
if (eErr != OGRERR_NONE)
m_bEOF = true;
return eErr;
}
}
/************************************************************************/
/* GetExtent() */
/************************************************************************/
OGRErr OGRGenSQLResultsLayer::GetExtent(int iGeomField, OGREnvelope *psExtent,
int bForce)
{
swq_select *psSelectInfo = m_pSelectInfo.get();
if (iGeomField < 0 || iGeomField >= GetLayerDefn()->GetGeomFieldCount() ||
GetLayerDefn()->GetGeomFieldDefn(iGeomField)->GetType() == wkbNone)
{
if (iGeomField != 0)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Invalid geometry field index : %d", iGeomField);
}
return OGRERR_FAILURE;
}
if (psSelectInfo->query_mode == SWQM_RECORDSET)
{
int iSrcGeomField = m_anGeomFieldToSrcGeomField[iGeomField];
if (iSrcGeomField >= 0)
return m_poSrcLayer->GetExtent(iSrcGeomField, psExtent, bForce);
else if (iGeomField == 0)
return OGRLayer::GetExtent(psExtent, bForce);
else
return OGRLayer::GetExtent(iGeomField, psExtent, bForce);
}
else
return OGRERR_FAILURE;
}
/************************************************************************/
/* GetFeatureCount() */
/************************************************************************/
GIntBig OGRGenSQLResultsLayer::GetFeatureCount(int bForce)
{
swq_select *psSelectInfo = m_pSelectInfo.get();
CreateOrderByIndex();
GIntBig nRet = 0;
if (psSelectInfo->query_mode == SWQM_DISTINCT_LIST)
{
if (!PrepareSummary())
return 0;
if (psSelectInfo->column_summary.empty())
return 0;
nRet = psSelectInfo->column_summary[0].count;
}
else if (psSelectInfo->query_mode != SWQM_RECORDSET)
return 1;
else if (m_poAttrQuery == nullptr && !MustEvaluateSpatialFilterOnGenSQL())
{
nRet = m_poSrcLayer->GetFeatureCount(bForce);
}
else
{
nRet = OGRLayer::GetFeatureCount(bForce);
}
if (nRet < 0)
return nRet;
nRet = std::max(static_cast<GIntBig>(0), nRet - psSelectInfo->offset);
if (psSelectInfo->limit >= 0)
nRet = std::min(nRet, psSelectInfo->limit);
return nRet;
}
/************************************************************************/
/* TestCapability() */
/************************************************************************/
int OGRGenSQLResultsLayer::TestCapability(const char *pszCap)
{
const swq_select *psSelectInfo = m_pSelectInfo.get();
if (EQUAL(pszCap, OLCFastSetNextByIndex))
{
if (psSelectInfo->query_mode == SWQM_SUMMARY_RECORD ||
psSelectInfo->query_mode == SWQM_DISTINCT_LIST ||
!m_anFIDIndex.empty())
return TRUE;
else
return m_poSrcLayer->TestCapability(pszCap);
}
if (psSelectInfo->query_mode == SWQM_RECORDSET &&
(EQUAL(pszCap, OLCFastFeatureCount) || EQUAL(pszCap, OLCRandomRead) ||
EQUAL(pszCap, OLCFastGetExtent)))
return m_poSrcLayer->TestCapability(pszCap);
else if (psSelectInfo->query_mode != SWQM_RECORDSET)
{
if (EQUAL(pszCap, OLCFastFeatureCount))
return TRUE;
}
if (EQUAL(pszCap, OLCStringsAsUTF8) || EQUAL(pszCap, OLCCurveGeometries) ||
EQUAL(pszCap, OLCMeasuredGeometries) || EQUAL(pszCap, OLCZGeometries))
{
return m_poSrcLayer->TestCapability(pszCap);
}
else if (EQUAL(pszCap, OLCFastGetArrowStream))
{
// Make sure the SQL is something as simple as
// "SELECT field1 [AS renamed], ... FROM ... WHERE ....", without
// duplicated fields
if (m_bForwardWhereToSourceLayer &&
psSelectInfo->query_mode == SWQM_RECORDSET &&
psSelectInfo->offset == 0 && psSelectInfo->join_count == 0 &&
psSelectInfo->order_specs == 0)
{
std::set<int> oSetFieldIndex;
int nLastIdxRegularField = -1;
for (std::size_t iField = 0;
iField < psSelectInfo->column_defs.size(); iField++)
{
const swq_col_def *psColDef =
&psSelectInfo->column_defs[iField];
if (psColDef->bHidden || psColDef->table_index < 0 ||
psColDef->col_func != SWQCF_NONE ||
cpl::contains(oSetFieldIndex, psColDef->field_index))
{
return false;
}
oSetFieldIndex.insert(psColDef->field_index);
const auto poLayerDefn =
m_apoTableLayers[psColDef->table_index]->GetLayerDefn();
if (psColDef->field_index >= 0 && poLayerDefn != nullptr &&
psColDef->field_index < poLayerDefn->GetFieldCount())
{
// We do not support re-ordered fields
if (psColDef->field_index <= nLastIdxRegularField)
return false;
nLastIdxRegularField = psColDef->field_index;
}
else if (poLayerDefn != nullptr &&
IS_GEOM_FIELD_INDEX(poLayerDefn,
psColDef->field_index))
{
// ok
}
else
{
return false;
}
}
return m_poSrcLayer->TestCapability(pszCap);
}
}
return FALSE;
}
/************************************************************************/
/* ContainGeomSpecialField() */
/************************************************************************/
int OGRGenSQLResultsLayer::ContainGeomSpecialField(swq_expr_node *expr)
{
if (expr->eNodeType == SNT_COLUMN)
{
if (expr->table_index == 0 && expr->field_index != -1)
{
OGRLayer *poLayer = m_apoTableLayers[expr->table_index];
int nSpecialFieldIdx =
expr->field_index - poLayer->GetLayerDefn()->GetFieldCount();
if (nSpecialFieldIdx == SPF_OGR_GEOMETRY ||
nSpecialFieldIdx == SPF_OGR_GEOM_WKT ||
nSpecialFieldIdx == SPF_OGR_GEOM_AREA)
return TRUE;
if (expr->field_index ==
GEOM_FIELD_INDEX_TO_ALL_FIELD_INDEX(poLayer->GetLayerDefn(), 0))
return TRUE;
return FALSE;
}
}
else if (expr->eNodeType == SNT_OPERATION)
{
for (int i = 0; i < expr->nSubExprCount; i++)
{
if (ContainGeomSpecialField(expr->papoSubExpr[i]))
return TRUE;
}
}
return FALSE;
}
/************************************************************************/
/* PrepareSummary() */
/************************************************************************/
bool OGRGenSQLResultsLayer::PrepareSummary()
{
swq_select *psSelectInfo = m_pSelectInfo.get();
if (m_poSummaryFeature)
return true;
m_poSummaryFeature = std::make_unique<OGRFeature>(m_poDefn);
m_poSummaryFeature->SetFID(0);
/* -------------------------------------------------------------------- */
/* Ensure our query parameters are in place on the source */
/* layer. And initialize reading. */
/* -------------------------------------------------------------------- */
ApplyFiltersToSource();
/* -------------------------------------------------------------------- */
/* Ignore geometry reading if no spatial filter in place and that */
/* the where clause and no column references OGR_GEOMETRY, */
/* OGR_GEOM_WKT or OGR_GEOM_AREA special fields. */
/* -------------------------------------------------------------------- */
struct TempGeomIgnoredSetter
{
OGRFeatureDefn &m_oDefn;
const int m_bSaveIsGeomIgnored;
explicit TempGeomIgnoredSetter(OGRFeatureDefn *poDefn)
: m_oDefn(*poDefn),
m_bSaveIsGeomIgnored(poDefn->IsGeometryIgnored())
{
m_oDefn.SetGeometryIgnored(true);
}
~TempGeomIgnoredSetter()
{
m_oDefn.SetGeometryIgnored(m_bSaveIsGeomIgnored);
}
};
auto poSrcLayerDefn = m_poSrcLayer->GetLayerDefn();
std::unique_ptr<TempGeomIgnoredSetter> oTempGeomIgnoredSetter;
if (m_poFilterGeom == nullptr &&
(psSelectInfo->where_expr == nullptr ||
!ContainGeomSpecialField(psSelectInfo->where_expr)))
{
bool bFoundGeomExpr = false;
for (int iField = 0; iField < psSelectInfo->result_columns(); iField++)
{
const swq_col_def *psColDef = &psSelectInfo->column_defs[iField];
if (psColDef->table_index == 0 && psColDef->field_index != -1)
{
OGRLayer *poLayer = m_apoTableLayers[psColDef->table_index];
const int nSpecialFieldIdx =
psColDef->field_index -
poLayer->GetLayerDefn()->GetFieldCount();
if (nSpecialFieldIdx == SPF_OGR_GEOMETRY ||
nSpecialFieldIdx == SPF_OGR_GEOM_WKT ||
nSpecialFieldIdx == SPF_OGR_GEOM_AREA)
{
bFoundGeomExpr = true;
break;
}
if (psColDef->field_index ==
GEOM_FIELD_INDEX_TO_ALL_FIELD_INDEX(poLayer->GetLayerDefn(),
0))
{
bFoundGeomExpr = true;
break;
}
}
if (psColDef->expr != nullptr &&
ContainGeomSpecialField(psColDef->expr))
{
bFoundGeomExpr = true;
break;
}
}
if (!bFoundGeomExpr)
{
// cppcheck-suppress unreadVariable
oTempGeomIgnoredSetter =
std::make_unique<TempGeomIgnoredSetter>(poSrcLayerDefn);
}
}
/* -------------------------------------------------------------------- */
/* We treat COUNT(*) as a special case, and fill with */
/* GetFeatureCount(). */
/* -------------------------------------------------------------------- */
if (psSelectInfo->result_columns() == 1 &&
psSelectInfo->column_defs[0].col_func == SWQCF_COUNT &&
psSelectInfo->column_defs[0].field_index < 0)
{
GIntBig nRes = m_poSrcLayer->GetFeatureCount(TRUE);
m_poSummaryFeature->SetField(0, nRes);
if (CPL_INT64_FITS_ON_INT32(nRes))
{
m_poSummaryFeature.reset();
m_poDefn->GetFieldDefn(0)->SetType(OFTInteger);
m_poSummaryFeature = std::make_unique<OGRFeature>(m_poDefn);
m_poSummaryFeature->SetFID(0);
m_poSummaryFeature->SetField(0, static_cast<int>(nRes));
}
return TRUE;
}
/* -------------------------------------------------------------------- */
/* Otherwise, process all source feature through the summary */
/* building facilities of SWQ. */
/* -------------------------------------------------------------------- */
for (auto &&poSrcFeature : *m_poSrcLayer)
{
for (int iField = 0; iField < psSelectInfo->result_columns(); iField++)
{
const swq_col_def *psColDef = &psSelectInfo->column_defs[iField];
const char *pszError = nullptr;
if (psColDef->col_func == SWQCF_COUNT)
{
/* psColDef->field_index can be -1 in the case of a COUNT(*) */
if (psColDef->field_index < 0)
pszError =
swq_select_summarize(psSelectInfo, iField, "", nullptr);
else if (IS_GEOM_FIELD_INDEX(poSrcLayerDefn,
psColDef->field_index))
{
const int iSrcGeomField =
ALL_FIELD_INDEX_TO_GEOM_FIELD_INDEX(
poSrcLayerDefn, psColDef->field_index);
const OGRGeometry *poGeom =
poSrcFeature->GetGeomFieldRef(iSrcGeomField);
if (poGeom != nullptr)
pszError = swq_select_summarize(psSelectInfo, iField,
"", nullptr);
}
else if (poSrcFeature->IsFieldSetAndNotNull(