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+# MOVENULLS -- Move all null elements to the end of the index array
+#
+# This procedure rearranges an array of row indices so that all rows with
+# nulls in a particular column are moved to the end of the index array.
+# The position of the nulls in the column is indicated by an array of null
+# flags, whose length might be greater than the length of the array of
+# indices, i.e., only a subset of the rows in a table might be in the index
+# array.
+#
+# B.Simon	15-Dec-87	First Code
+
+int procedure movenulls (nindex, nulflg, index) 
+
+int	nindex		#  i: Number of indices
+bool	nulflg[ARB]	#  i: Array of null flags
+int	index[ARB]	# io: Array of row indices
+#--
+int	nelem, idx, jdx
+
+begin
+	nelem = nindex
+
+	do idx = nindex, 1, -1 {
+	    jdx = index[idx]
+	    if (nulflg[jdx]) {
+		if (nelem != idx) {
+		    index[idx] = index[nelem]
+		    index[nelem] = jdx
+		}
+		nelem = nelem - 1
+	    }
+	}
+
+	return (nelem)
+end