googleapis / googleapis/google-cloud-go
spanner: support parsing lambda expressions
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api: spanner
priority: p3
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Description
**Is your feature request related to a problem? Please describe.**
While working on PR [10079](https://github.com/googleapis/google-cloud-go/pull/10079) I noticed that `ARRAY_FILTER` takes a lambda expression as an argument. The parser doesn't support [lambda expressions](https://cloud.google.com/spanner/docs/reference/standard-sql/functions-reference#lambdas).
**Describe the solution you'd like**
Parser should be able to parse a function expression like `ARRAY_FILTER([1 ,2, 3], e -> e > 1)`
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