if ( exprNameSet.size( ) == 0 ) {  exprNameSet = getExprNameSet( ); }
	private void saveForIV( ) throws DataException	{		// save expression metadata and transformation info		this.rdSaveUtil.saveExprMetadata( exprNameSet );		if ( this.streamManager.isSubquery( ) == false )			this.rdSaveUtil.saveQueryDefn( );	}