arg("pageBuilder", PageBuilder.class),
arg("outputChannelOffset", int.class))
.getBody();
for (int index = 0; index < channelFields.size(); index++) {
appendToBody.pushThis()
.getField(channelFields.get(index))
.getVariable("blockIndex")
.invokeInterface(List.class, "get", Object.class, int.class)
.checkCast(com.facebook.presto.spi.block.Block.class)
.getVariable("blockPosition")