perf: use protobuf for metadata to reduce type conversions #325
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product-auto-label bot added the api: spanner 
google-cla bot added the cla: yes 
larkee added kokoro:force-run 
yoshi-kokoro removed kokoro:run 
zoercai approved these changes Apr 29, 2021
vi3k6i5 approved these changes Apr 29, 2021
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To fix performance issues in #207, the streaming logic switched to using the underlying protobuf objects instead of the
proto-plusobjects which have an type conversion overhead when accessing values. However, the metadata proto was kept in theproto-plusformat. This metadata object contains the type information of the different fields which means it is frequently accessed when iterating over arrays. This causes major performance issues for large scale arrays due to the type conversion overhead. Using the underlying protobuf for the metadata removes this overhead and brings the performance in line withv1.17.1.Fixes #310