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perf: improve streaming performance #240

merged 2 commits into from Feb 23, 2021

perf: improve streaming performance #240

merged 2 commits into from Feb 23, 2021


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@larkee larkee commented Feb 22, 2021

This PR fixes performance issues that were introduced during the mirgration to v2 and optimizes several streaming methods.

From v2 onwards, the library uses proto-plus to produce user friendly Python object to represent proto messages. Unfortunately, it significantly impacted the performance of streaming for cases with many columns as the library must unnecessarily parse the types many times. By reverting the streaming changes to use the raw protobuf messages, the streaming speed is greatly improved.

Fixes #207, fixes #234

@product-auto-label product-auto-label bot added the api: spanner label Feb 22, 2021
@google-cla google-cla bot added the cla: yes label Feb 22, 2021
@larkee larkee marked this pull request as ready for review Feb 23, 2021
@larkee larkee requested a review from as a code owner Feb 23, 2021
@larkee larkee merged commit 3e35d4a into googleapis:master Feb 23, 2021
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def _merge_values(self, values):
"""Merge values into rows.
:type values: list of :class:`~google.protobuf.struct_pb2.Value`
:param values: non-chunked values from partial result set.
width = len(self.fields)
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@harmon harmon Feb 26, 2021

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Did this make it into the final code?

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