this.exprNameSet = exprNameSet;
	RowSaveUtil( int rowCount, OutputStream rowExprsOs,			OutputStream rowLenOs )	{		this.rowCount = rowCount;		this.exprNameSet = new HashSet( );		this.rowExprsDos = new DataOutputStream( rowExprsOs );		this.rowLenDos = new DataOutputStream( rowLenOs );		this.lastRowIndex = -1;	}