greenplumn CParseHandlerMDGPDBScalarOp 源码
greenplumn CParseHandlerMDGPDBScalarOp 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerMDGPDBScalarOp.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CParseHandlerMDGPDBScalarOp.h
//
// @doc:
// SAX parse handler class for GPDB scalar operator metadata
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerMDGPDBScalarOp_H
#define GPDXL_CParseHandlerMDGPDBScalarOp_H
#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerMetadataObject.h"
namespace gpdxl
{
using namespace gpos;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerMDGPDBScalarOp
//
// @doc:
// Parse handler for GPDB scalar operator metadata
//
//---------------------------------------------------------------------------
class CParseHandlerMDGPDBScalarOp : public CParseHandlerMetadataObject
{
private:
// id and version
IMDId *m_mdid;
// name
CMDName *m_mdname;
// type of left operand
IMDId *m_mdid_type_left;
// type of right operand
IMDId *m_mdid_type_right;
// type of result operand
IMDId *m_mdid_type_result;
// id of function which implements the operator
IMDId *m_func_mdid;
// id of commute operator
IMDId *m_mdid_commute_opr;
// id of inverse operator
IMDId *m_mdid_inverse_opr;
// comparison type
IMDType::ECmpType m_comparision_type;
// does operator return NULL on NULL input?
BOOL m_returns_null_on_null_input;
IMDId *m_mdid_hash_opfamily;
IMDId *m_mdid_legacy_hash_opfamily;
// preserves NDVs of inputs
BOOL m_is_ndv_preserving;
// process the start of an element
void StartElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname, // element's qname
const Attributes &attr // element's attributes
) override;
// process the end of an element
void EndElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname // element's qname
) override;
// is this a supported child elem of the scalar op
static BOOL IsSupportedChildElem(const XMLCh *const xml_str);
public:
CParseHandlerMDGPDBScalarOp(const CParseHandlerMDGPDBScalarOp &) = delete;
// ctor
CParseHandlerMDGPDBScalarOp(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerMDGPDBScalarOp_H
// EOF
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