Github user davies commented on the pull request:
https://github.com/apache/spark/pull/11130#issuecomment-181988539
For query:
```
val dim = broadcast(sqlContext.range(1 << 16).selectExpr("id as k",
"cast(id as string) as v"))
sqlContext.range(N).join(dim, (col("id") % 60000) === col("k"),
"left").count()
```
will generate:
```
/* 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 org.apache.spark.broadcast.TorrentBroadcast
join_broadcast;
/* 013 */ private org.apache.spark.sql.execution.joins.LongArrayRelation
join_relation;
/* 014 */ private boolean range_initRange;
/* 015 */ private long range_partitionEnd;
/* 016 */ private long range_number;
/* 017 */ private boolean range_overflow;
/* 018 */ private UnsafeRow agg_result;
/* 019 */ private
org.apache.spark.sql.catalyst.expressions.codegen.BufferHolder agg_holder;
/* 020 */ private
org.apache.spark.sql.catalyst.expressions.codegen.UnsafeRowWriter agg_rowWriter;
/* 021 */
/* 022 */ public GeneratedIterator(Object[] references) {
/* 023 */ this.references = references;
/* 024 */ agg_initAgg = false;
/* 025 */
/* 026 */
/* 027 */ this.join_broadcast =
(org.apache.spark.broadcast.TorrentBroadcast) references[0];
/* 028 */
/* 029 */ join_relation =
(org.apache.spark.sql.execution.joins.LongArrayRelation) join_broadcast.value();
/* 030 */ incPeakExecutionMemory(join_relation.getMemorySize());
/* 031 */
/* 032 */ range_initRange = false;
/* 033 */ range_partitionEnd = 0L;
/* 034 */ range_number = 0L;
/* 035 */ range_overflow = false;
/* 036 */ agg_result = new UnsafeRow(1);
/* 037 */ this.agg_holder = new
org.apache.spark.sql.catalyst.expressions.codegen.BufferHolder(agg_result, 0);
/* 038 */ this.agg_rowWriter = new
org.apache.spark.sql.catalyst.expressions.codegen.UnsafeRowWriter(agg_holder,
1);
/* 039 */ }
/* 040 */
/* 041 */
/* 042 */ private void agg_doAggregateWithoutKey() throws
java.io.IOException {
/* 043 */ // initialize aggregation buffer
/* 044 */
/* 045 */ agg_bufIsNull = false;
/* 046 */ agg_bufValue = 0L;
/* 047 */
/* 048 */
/* 049 */
/* 050 */
/* 051 */ // initialize Range
/* 052 */ if (!range_initRange) {
/* 053 */ range_initRange = true;
/* 054 */ if (input.hasNext()) {
/* 055 */ initRange(((InternalRow) input.next()).getInt(0));
/* 056 */ } else {
/* 057 */ return;
/* 058 */ }
/* 059 */ }
/* 060 */
/* 061 */ while (!range_overflow && range_number < range_partitionEnd) {
/* 062 */ long range_value = range_number;
/* 063 */ range_number += 1L;
/* 064 */ if (range_number < range_value ^ 1L < 0) {
/* 065 */ range_overflow = true;
/* 066 */ }
/* 067 */
/* 068 */ // generate join key
/* 069 */ /* (input[0, bigint] % 60000) */
/* 070 */ boolean join_isNull = false;
/* 071 */ long join_value = -1L;
/* 072 */ if (false || 60000L == 0) {
/* 073 */ join_isNull = true;
/* 074 */ } else {
/* 075 */
/* 076 */ if (false) {
/* 077 */ join_isNull = true;
/* 078 */ } else {
/* 079 */ join_value = (long)(range_value % 60000L);
/* 080 */ }
/* 081 */ }
/* 082 */ // find matches from HashedRelation
/* 083 */ UnsafeRow join_matched = join_isNull ? null:
(UnsafeRow)join_relation.getValue(join_value);
/* 084 */
/* 085 */ boolean join_isNull4 = true;
/* 086 */ long join_value4 = -1L;
/* 087 */ if (join_matched != null) {
/* 088 */ /* input[0, bigint] */
/* 089 */ long join_value3 = join_matched.getLong(0);
/* 090 */ join_isNull4 = false;
/* 091 */ join_value4 = join_value3;
/* 092 */ }
/* 093 */
/* 094 */ final boolean join_invalid = true;
/* 095 */ if (!join_invalid) {
/* 096 */ // reset to null
/* 097 */ join_isNull4 = true;
/* 098 */ }
/* 099 */
/* 100 */
/* 101 */
/* 102 */
/* 103 */ // do aggregate
/* 104 */ /* (input[0, bigint] + 1) */
/* 105 */ long agg_value1 = -1L;
/* 106 */ agg_value1 = agg_bufValue + 1L;
/* 107 */ // update aggregation buffer
/* 108 */ agg_bufIsNull = false;
/* 109 */ agg_bufValue = agg_value1;
/* 110 */
/* 111 */
/* 112 */
/* 113 */
/* 114 */ if (shouldStop()) return;
/* 115 */ }
/* 116 */
/* 117 */
/* 118 */ }
/* 119 */
/* 120 */
/* 121 */ private void initRange(int idx) {
/* 122 */ java.math.BigInteger index =
java.math.BigInteger.valueOf(idx);
/* 123 */ java.math.BigInteger numSlice =
java.math.BigInteger.valueOf(1L);
/* 124 */ java.math.BigInteger numElement =
java.math.BigInteger.valueOf(102400L);
/* 125 */ java.math.BigInteger step = java.math.BigInteger.valueOf(1L);
/* 126 */ java.math.BigInteger start = java.math.BigInteger.valueOf(0L);
/* 127 */
/* 128 */ java.math.BigInteger st =
index.multiply(numElement).divide(numSlice).multiply(step).add(start);
/* 129 */ if
(st.compareTo(java.math.BigInteger.valueOf(Long.MAX_VALUE)) > 0) {
/* 130 */ range_number = Long.MAX_VALUE;
/* 131 */ } else if
(st.compareTo(java.math.BigInteger.valueOf(Long.MIN_VALUE)) < 0) {
/* 132 */ range_number = Long.MIN_VALUE;
/* 133 */ } else {
/* 134 */ range_number = st.longValue();
/* 135 */ }
/* 136 */
/* 137 */ java.math.BigInteger end =
index.add(java.math.BigInteger.ONE).multiply(numElement).divide(numSlice)
/* 138 */ .multiply(step).add(start);
/* 139 */ if
(end.compareTo(java.math.BigInteger.valueOf(Long.MAX_VALUE)) > 0) {
/* 140 */ range_partitionEnd = Long.MAX_VALUE;
/* 141 */ } else if
(end.compareTo(java.math.BigInteger.valueOf(Long.MIN_VALUE)) < 0) {
/* 142 */ range_partitionEnd = Long.MIN_VALUE;
/* 143 */ } else {
/* 144 */ range_partitionEnd = end.longValue();
/* 145 */ }
/* 146 */ }
/* 147 */
/* 148 */
/* 149 */ protected void processNext() throws java.io.IOException {
/* 150 */ if (!agg_initAgg) {
/* 151 */ agg_initAgg = true;
/* 152 */ agg_doAggregateWithoutKey();
/* 153 */
/* 154 */ // output the result
/* 155 */
/* 156 */
/* 157 */ agg_rowWriter.zeroOutNullBytes();
/* 158 */
/* 159 */
/* 160 */ if (agg_bufIsNull) {
/* 161 */ agg_rowWriter.setNullAt(0);
/* 162 */ } else {
/* 163 */ agg_rowWriter.write(0, agg_bufValue);
/* 164 */ }
/* 165 */ currentRows.add(agg_result.copy());
/* 166 */ }
/* 167 */ }
/* 168 */ }
/* 169 */
```
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