spanner: Use bigdecimal instead of SpannerNumeric

yoshidan / google-cloud-rust

Google Cloud Client Libraries for Rust.

MIT License

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Closed yoshidan closed 1 year ago

yoshidan commented 1 year ago

Removed SpannerNumeric because it is just string.
Added bigdecimal. It supports Google SQL NUMERIC.

The GoogleSQL NUMERIC data type can represent numbers with a fixed decimal precision of 38 and fixed scale of 9. The range of GoogleSQL NUMERIC is -99999999999999999999999999999.999999999 to 99999999999999999999999999999.999999999.