fix: handle Unmergable errors when merging struct responses #152
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🤖 I have created a release \*beep\* \*boop\* --- ### [1.19.1](https://www.github.com/googleapis/python-spanner/compare/v1.19.0...v1.19.1) (2020-10-13) ### Bug Fixes * handle Unmergable errors when merging struct responses ([#152](https://www.github.com/googleapis/python-spanner/issues/152)) ([d132409](https://www.github.com/googleapis/python-spanner/commit/d132409dd4300cb2dca7c4bc7dbdd4d429d2fa7c)) ### Documentation * update samples dep to 'google-cloud-spanner==1.19.0' ([#137](https://www.github.com/googleapis/python-spanner/issues/137)) ([0fba41a](https://www.github.com/googleapis/python-spanner/commit/0fba41a5c19b02b0424705618dd1e2e5ca12238f)) * update samples from python-docs-samples ([#146](https://www.github.com/googleapis/python-spanner/issues/146)) ([7549383](https://www.github.com/googleapis/python-spanner/commit/754938386c96814a3546d30d38d874734d1c201c)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please).
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This PR fixes a bug in the
StreamedResultSetlogic for merging chunked values where the chunked value is an array of structs and the chunk boundary splits a struct element in two and the halves aren't correctly merged.This bug results in the struct element incorrectly being split into two partial struct elements.
Expected:
Actual:
This bug is caused by an unhandled
Unmergableerror in_merge_struct. This PR adds the same handling used for_merge_arrayand a unit test to prove the fix works.