greenplumn IMDRelation 代码
文件路径：/src/backend/gporca/libnaucrates/src/md/IMDRelation.cpp
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2013 EMC Corp.
/
/ @filename:
/ IMDRelation.cpp
/
/ @doc:
/ Implementation
/---------------------------------------------------------------------------
#include "naucrates/md/IMDRelation.h"
#include "gpos/string/CWStringDynamic.h"
#include "naucrates/dxl/xml/CXMLSerializer.h"
using namespace gpdxl;
using namespace gpmd;
/---------------------------------------------------------------------------
/ @function:
/ IMDRelation::GetDistrPolicyStr
/
/ @doc:
/ Return relation distribution policy as a string value
/
/---------------------------------------------------------------------------
const CWStringConst *
IMDRelation::GetDistrPolicyStr(Ereldistrpolicy rel_distr_policy)
{
switch (rel_distr_policy)
{
case EreldistrMasterOnly:
return CDXLTokens::GetDXLTokenStr(EdxltokenRelDistrMasterOnly);
case EreldistrHash:
return CDXLTokens::GetDXLTokenStr(EdxltokenRelDistrHash);
case EreldistrRandom:
return CDXLTokens::GetDXLTokenStr(EdxltokenRelDistrRandom);
case EreldistrReplicated:
return CDXLTokens::GetDXLTokenStr(EdxltokenRelDistrReplicated);
default:
return nullptr;
}
}
/---------------------------------------------------------------------------
/ @function:
/ IMDRelation::GetStorageTypeStr
/
/ @doc:
/ Return name of storage type
/
/---------------------------------------------------------------------------
const CWStringConst *
IMDRelation::GetStorageTypeStr(IMDRelation::Erelstoragetype rel_storage_type)
{
switch (rel_storage_type)
{
case ErelstorageHeap:
return CDXLTokens::GetDXLTokenStr(EdxltokenRelStorageHeap);
case ErelstorageAppendOnlyCols:
return CDXLTokens::GetDXLTokenStr(
EdxltokenRelStorageAppendOnlyCols);
case ErelstorageAppendOnlyRows:
return CDXLTokens::GetDXLTokenStr(
EdxltokenRelStorageAppendOnlyRows);
case ErelstorageExternal:
return CDXLTokens::GetDXLTokenStr(EdxltokenRelStorageExternal);
case ErelstorageMixedPartitioned:
return CDXLTokens::GetDXLTokenStr(
EdxltokenRelStorageMixedPartitioned);
case ErelstorageCompositeType:
return CDXLTokens::GetDXLTokenStr(EdxltokenRelStorageCompositeType);
default:
return nullptr;
}
}
/---------------------------------------------------------------------------
/ @function:
/ IMDRelation::ColumnsToStr
/
/ @doc:
/ Serialize an array of column ids into a comma-separated string
/
/---------------------------------------------------------------------------
CWStringDynamic *
IMDRelation::ColumnsToStr(CMemoryPool *mp, ULongPtrArray *colid_array)
{
CWStringDynamic *str = GPOS_NEW(mp) CWStringDynamic(mp);
ULONG length = colid_array->Size();
for (ULONG ul = 0; ul < length; ul++)
{
ULONG id = *((*colid_array)[ul]);
if (ul == length - 1)
{
/ last element: do not print a comma
str->AppendFormat(GPOS_WSZ_LIT("%d"), id);
}
else
{
str->AppendFormat(
GPOS_WSZ_LIT("%d%ls"), id,
CDXLTokens::GetDXLTokenStr(EdxltokenComma)->GetBuffer());
}
}
return str;
}
/ EOF
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