Github user davies commented on the pull request:
https://github.com/apache/spark/pull/11065#issuecomment-180065661
For join with single Long key:
```
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")).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
bhj_broadcast;
/* 013 */ private org.apache.spark.sql.execution.joins.LongArrayRelation
bhj_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.bhj_broadcast =
(org.apache.spark.broadcast.TorrentBroadcast) references[0];
/* 028 */
/* 029 */ bhj_relation =
(org.apache.spark.sql.execution.joins.LongArrayRelation) bhj_broadcast.value();
/* 030 */ incPeakExecutionMemory(bhj_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
/* 045 */ agg_bufIsNull = false;
/* 046 */ agg_bufValue = 0L;
/* 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 */ /* cast((input[0, bigint] % 60000) as bigint) */
/* 070 */ /* (input[0, bigint] % 60000) */
/* 071 */ boolean bhj_isNull1 = false;
/* 072 */ long bhj_value1 = -1L;
/* 073 */ if (false || 60000L == 0) {
/* 074 */ bhj_isNull1 = true;
/* 075 */ } else {
/* 076 */
/* 077 */ if (false) {
/* 078 */ bhj_isNull1 = true;
/* 079 */ } else {
/* 080 */ bhj_value1 = (long)(range_value % 60000L);
/* 081 */ }
/* 082 */ }
/* 083 */ boolean bhj_isNull = bhj_isNull1;
/* 084 */ long bhj_value = -1L;
/* 085 */ if (!bhj_isNull1) {
/* 086 */ bhj_value = bhj_value1;
/* 087 */ }
/* 088 */ // find matches from HashedRelation
/* 089 */ UnsafeRow bhj_matched = bhj_isNull ?
null:(UnsafeRow)bhj_relation.getValue(bhj_value);
/* 090 */ if (bhj_matched != null) {
/* 091 */ /* input[0, bigint] */
/* 092 */ long bhj_value4 = bhj_matched.getLong(0);
/* 097 */ // do aggregate
/* 098 */ /* (input[0, bigint] + 1) */
/* 099 */ long agg_value1 = -1L;
/* 100 */ agg_value1 = agg_bufValue + 1L;
/* 101 */ // update aggregation buffer
/* 102 */ agg_bufIsNull = false;
/* 103 */ agg_bufValue = agg_value1;
/* 106 */ }
/* 109 */ if (shouldStop()) return;
/* 110 */ }
/* 113 */ }
/* 116 */ private void initRange(int idx) {
/* 141 */ }
/* 142 */
/* 143 */
/* 144 */ protected void processNext() throws java.io.IOException {
/* 145 */ if (!agg_initAgg) {
/* 146 */ agg_initAgg = true;
/* 147 */ agg_doAggregateWithoutKey();
/* 148 */
/* 149 */ // output the result
/* 150 */
/* 151 */
/* 152 */ agg_rowWriter.zeroOutNullBytes();
/* 153 */
/* 154 */
/* 155 */ if (agg_bufIsNull) {
/* 156 */ agg_rowWriter.setNullAt(0);
/* 157 */ } else {
/* 158 */ agg_rowWriter.write(0, agg_bufValue);
/* 159 */ }
/* 160 */ currentRows.add(agg_result.copy());
/* 161 */ }
/* 162 */ }
/* 163 */ }
/* 164 */
```
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