Merge pull request #157 from danieldeleo/cicd-nit-refactor

Remove unnecessary dependency installs since wget & unzip are now packaged into gcr.io/bqutil/bq_udf_ci:infrastructure-public-image-bqutil image & remove use of git submodule since Makefile now explicitly copies in the submodule contents

Merge pull request #156 from danieldeleo/patch-pin-emsdk-version

update readme

pin emsdk to v4.0.7

Merge pull request #153 from apache/fix_upload

fixed compatibility with Google deployment

Merge pull request #150 from apache/export_heapu8

export HEAPU8 explicitly

Merge pull request #149 from apache/null_handling

aggs produce null with null input

Merge pull request #148 from apache/null_handling

fixed tuple sketch null handling

added semicolon for consistency

fixed null handling in scalar functions