Github user davies commented on the pull request:
https://github.com/apache/spark/pull/11032#issuecomment-178846031
```
/* 001 */
/* 002 */ public Object generate(Object[] references) {
/* 003 */ return new GeneratedIterator(references);
/* 004 */ }
/* 005 */
/* 006 */ class GeneratedIterator extends
org.apache.spark.sql.execution.BufferedRowIterator {
/* 007 */
/* 008 */ private Object[] references;
/* 009 */ private boolean agg_initAgg;
/* 010 */ private boolean agg_bufIsNull;
/* 011 */ private long agg_bufValue;
/* 012 */ private UnsafeRow agg_result;
/* 013 */ private
org.apache.spark.sql.catalyst.expressions.codegen.BufferHolder agg_holder;
/* 014 */ private
org.apache.spark.sql.catalyst.expressions.codegen.UnsafeRowWriter agg_rowWriter;
/* 015 */
/* 016 */ public GeneratedIterator(Object[] references) {
/* 017 */ this.references = references;
/* 018 */ agg_initAgg = false;
/* 019 */
/* 020 */ agg_result = new UnsafeRow(1);
/* 021 */ this.agg_holder = new
org.apache.spark.sql.catalyst.expressions.codegen.BufferHolder(agg_result, 0);
/* 022 */ this.agg_rowWriter = new
org.apache.spark.sql.catalyst.expressions.codegen.UnsafeRowWriter(agg_holder,
1);
/* 023 */ }
/* 024 */
/* 025 */ private void agg_doAggregateWithoutKey() throws
java.io.IOException {
/* 026 */ // initialize aggregation buffer
/* 027 */
/* 028 */ agg_bufIsNull = false;
/* 029 */ agg_bufValue = 0L;
/* 030 */
/* 031 */ while (input.hasNext()) {
/* 032 */ InternalRow inputadapter_row = (InternalRow) input.next();
/* 033 */ /* input[0, bigint] */
/* 034 */ boolean inputadapter_isNull = inputadapter_row.isNullAt(0);
/* 035 */ long inputadapter_value = inputadapter_isNull ? -1L :
(inputadapter_row.getLong(0));
/* 036 */ // do aggregate
/* 037 */ /* (input[0, bigint] + input[1, bigint]) */
/* 038 */ long agg_value3 = -1L;
/* 039 */ agg_value3 = agg_bufValue + inputadapter_value;
/* 040 */ // update aggregation buffer
/* 041 */ agg_bufIsNull = false;
/* 042 */ agg_bufValue = agg_value3;
/* 043 */ }
/* 044 */
/* 045 */ }
/* 046 */
/* 047 */ protected void processNext() throws java.io.IOException {
/* 048 */ if (!agg_initAgg) {
/* 049 */ agg_initAgg = true;
/* 050 */ agg_doAggregateWithoutKey();
/* 051 */
/* 052 */ // output the result
/* 053 */
/* 054 */ agg_rowWriter.zeroOutNullBytes();
/* 055 */
/* 056 */ if (agg_bufIsNull) {
/* 057 */ agg_rowWriter.setNullAt(0);
/* 058 */ } else {
/* 059 */ agg_rowWriter.write(0, agg_bufValue);
/* 060 */ }
/* 061 */ currentRow = agg_result;
/* 062 */ return;
/* 063 */ }
/* 064 */ }
/* 065 */ }
/* 066 */
/* 001 */
/* 002 */ public Object generate(Object[] references) {
/* 003 */ return new GeneratedIterator(references);
/* 004 */ }
/* 005 */
/* 006 */ class GeneratedIterator extends
org.apache.spark.sql.execution.BufferedRowIterator {
/* 007 */
/* 008 */ private Object[] references;
/* 009 */ private boolean agg_initAgg;
/* 010 */ private boolean agg_bufIsNull;
/* 011 */ private long agg_bufValue;
/* 012 */ private boolean range_initRange;
/* 013 */ private long range_partitionEnd;
/* 014 */ private long range_number;
/* 015 */ private boolean range_overflow;
/* 016 */ private UnsafeRow agg_result;
/* 017 */ private
org.apache.spark.sql.catalyst.expressions.codegen.BufferHolder agg_holder;
/* 018 */ private
org.apache.spark.sql.catalyst.expressions.codegen.UnsafeRowWriter agg_rowWriter;
/* 019 */
/* 020 */ public GeneratedIterator(Object[] references) {
/* 021 */ this.references = references;
/* 022 */ agg_initAgg = false;
/* 023 */
/* 024 */ range_initRange = false;
/* 025 */ range_partitionEnd = 0L;
/* 026 */ range_number = 0L;
/* 027 */ range_overflow = false;
/* 028 */ agg_result = new UnsafeRow(1);
/* 029 */ this.agg_holder = new
org.apache.spark.sql.catalyst.expressions.codegen.BufferHolder(agg_result, 0);
/* 030 */ this.agg_rowWriter = new
org.apache.spark.sql.catalyst.expressions.codegen.UnsafeRowWriter(agg_holder,
1);
/* 031 */ }
/* 032 */
/* 033 */ private void agg_doAggregateWithoutKey() throws
java.io.IOException {
/* 034 */ // initialize aggregation buffer
/* 035 */
/* 036 */ agg_bufIsNull = false;
/* 037 */ agg_bufValue = 0L;
/* 038 */
/* 039 */ // initialize Range
/* 040 */ if (!range_initRange) {
/* 041 */ range_initRange = true;
/* 042 */ if (input.hasNext()) {
/* 043 */ initRange(((InternalRow) input.next()).getInt(0));
/* 044 */ } else {
/* 045 */ return;
/* 046 */ }
/* 047 */ }
/* 048 */
/* 049 */ while (!range_overflow && range_number < range_partitionEnd) {
/* 050 */ long range_value = range_number;
/* 051 */ range_number += 1L;
/* 052 */ if (range_number < range_value ^ 1L < 0) {
/* 053 */ range_overflow = true;
/* 054 */ }
/* 055 */
/* 056 */ /* ((input[0, bigint] & 1) = 1) */
/* 057 */ /* (input[0, bigint] & 1) */
/* 058 */ long filter_value1 = -1L;
/* 059 */ filter_value1 = range_value & 1L;
/* 060 */
/* 061 */ boolean filter_value = false;
/* 062 */ filter_value = filter_value1 == 1L;
/* 063 */ if ( filter_value) {
/* 064 */
/* 065 */ // do aggregate
/* 066 */ /* (input[0, bigint] + 1) */
/* 067 */ long agg_value1 = -1L;
/* 068 */ agg_value1 = agg_bufValue + 1L;
/* 069 */ // update aggregation buffer
/* 070 */ agg_bufIsNull = false;
/* 071 */ agg_bufValue = agg_value1;
/* 072 */
/* 073 */ }
/* 074 */
/* 075 */ }
/* 076 */
/* 077 */ }
/* 078 */
/* 079 */ private void initRange(int idx) {
/* 080 */ java.math.BigInteger index =
java.math.BigInteger.valueOf(idx);
/* 081 */ java.math.BigInteger numSlice =
java.math.BigInteger.valueOf(1L);
/* 082 */ java.math.BigInteger numElement =
java.math.BigInteger.valueOf(209715200L);
/* 083 */ java.math.BigInteger step = java.math.BigInteger.valueOf(1L);
/* 084 */ java.math.BigInteger start = java.math.BigInteger.valueOf(0L);
/* 085 */
/* 086 */ java.math.BigInteger st =
index.multiply(numElement).divide(numSlice).multiply(step).add(start);
/* 087 */ if
(st.compareTo(java.math.BigInteger.valueOf(Long.MAX_VALUE)) > 0) {
/* 088 */ range_number = Long.MAX_VALUE;
/* 089 */ } else if
(st.compareTo(java.math.BigInteger.valueOf(Long.MIN_VALUE)) < 0) {
/* 090 */ range_number = Long.MIN_VALUE;
/* 091 */ } else {
/* 092 */ range_number = st.longValue();
/* 093 */ }
/* 094 */
/* 095 */ java.math.BigInteger end =
index.add(java.math.BigInteger.ONE).multiply(numElement).divide(numSlice)
/* 096 */ .multiply(step).add(start);
/* 097 */ if
(end.compareTo(java.math.BigInteger.valueOf(Long.MAX_VALUE)) > 0) {
/* 098 */ range_partitionEnd = Long.MAX_VALUE;
/* 099 */ } else if
(end.compareTo(java.math.BigInteger.valueOf(Long.MIN_VALUE)) < 0) {
/* 100 */ range_partitionEnd = Long.MIN_VALUE;
/* 101 */ } else {
/* 102 */ range_partitionEnd = end.longValue();
/* 103 */ }
/* 104 */ }
/* 105 */
/* 106 */ protected void processNext() throws java.io.IOException {
/* 107 */ if (!agg_initAgg) {
/* 108 */ agg_initAgg = true;
/* 109 */ agg_doAggregateWithoutKey();
/* 110 */
/* 111 */ // output the result
/* 112 */
/* 113 */ agg_rowWriter.zeroOutNullBytes();
/* 114 */
/* 115 */ if (agg_bufIsNull) {
/* 116 */ agg_rowWriter.setNullAt(0);
/* 117 */ } else {
/* 118 */ agg_rowWriter.write(0, agg_bufValue);
/* 119 */ }
/* 120 */ currentRow = agg_result;
/* 121 */ return;
/* 122 */ }
/* 123 */ }
/* 124 */ }
/* 125 */
```
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