code: public void putBuildRow(BaseRow row) throws IOException {
  		final int hashCode = hash(this.buildSideProjection.apply(row).hashCode(), 0);
  		// TODO: combine key projection and build side conversion to code gen.
  		insertIntoTable(originBuildSideSerializer.baseRowToBinary(row), hashCode);
  	}
docs: Put a build side row to hash table.