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This function receives two strings that are serialized Apache DataSketches HLL sketches. Union two sketches and returns the resulting sketch of union. Example: select ds_hll_estimate(ds_hll_union_f(i_i, h_i)) from hll_sketches_impala_hive2; +-------------------------------------------+ | ds_hll_estimate(ds_hll_union_f(i_i, h_i)) | +-------------------------------------------+ | 7 | +-------------------------------------------+ Change-Id: Ic06e959ed956af5cedbfc7d4d063141d5babb2a8 Reviewed-on: http://gerrit.cloudera.org:8080/16711 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>