Fix #382 leak of json in local/remote schema (valgrind)

src/searchd.cpp

@@ -5232,12 +5232,16 @@ void RemapResult ( const ISphSchema * pTarget, AggrResult_t * pRes )
		CSphSchema & dSchema = pRes->m_dSchemas[iSchema];
		for ( int i=0; i<pTarget->GetAttrsCount(); i++ )
		{
			dMapFrom.Add ( dSchema.GetAttrIndex ( pTarget->GetAttr(i).m_sName.cstr() ) );
			auto iSrcCol = dSchema.GetAttrIndex ( pTarget->GetAttr ( i ).m_sName.cstr () );
			const CSphColumnInfo &tSrcCol = dSchema.GetAttr ( iSrcCol );
			dMapFrom.Add ( iSrcCol );
			assert ( dMapFrom[i]>=0
				|| pTarget->GetAttr(i).m_tLocator.IsID()
				|| sphIsSortStringInternal ( pTarget->GetAttr(i).m_sName.cstr() )
				|| pTarget->GetAttr(i).m_sName=="@groupbystr"
				);
			int iOffset = tSrcCol.m_tLocator.m_iBitOffset / ( 8 * sizeof ( CSphRowitem ) );
			dSchema.DiscardPtr ( iOffset );
		}
		int iLimit = Min ( iCur + pRes->m_dMatchCounts[iSchema], pRes->m_dMatches.GetLength() );
		for ( int i=iCur; i<iLimit; i++ )
@@ -5275,6 +5279,7 @@ void RemapResult ( const ISphSchema * pTarget, AggrResult_t * pRes )
			}
			// swap out old (most likely wrong sized) match
			Swap ( tMatch, tRow );
			dSchema.FreeDataPtrs ( &tRow );
		}

		iCur = iLimit;

src/sphinx.cpp

@@ -6034,6 +6034,11 @@ void CSphSchemaHelper::FreeDataPtrs ( CSphMatch * pMatch ) const
	}
}

void CSphSchemaHelper::DiscardPtr ( int iAttr )
{
	m_dDataPtrAttrs.RemoveValue ( iAttr );
}


void CSphSchemaHelper::CloneMatch ( CSphMatch * pDst, const CSphMatch & rhs ) const
{

src/sphinx.h

@@ -1567,6 +1567,7 @@ class CSphSchemaHelper : public ISphSchema
public:
	virtual void	FreeDataPtrs ( CSphMatch * pMatch ) const;
	virtual void	CloneMatch ( CSphMatch * pDst, const CSphMatch & rhs ) const;
	void 			DiscardPtr ( int iAttr );

protected:
	CSphVector<int>	m_dDataPtrAttrs;				// rowitems of pointers to data that are stored inside matches