Abstract away "database" implementations and remove strong coupling of DB implementation with APIs#46
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- Also removes cloud-spanner specific fields from the return type. Specifically `StructType.Field` is removed from the return type. Removing this tightly coupled logic is required to allow new DB implementations.
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…f DB implementation with APIs 1. Abstracts SpannerDatabase with clear APIs 2. Introduces CloudSpannerDatabase as an implementation of SpannerDatabase 3. Removes further tight coupling with the cloud spanner client by adding a SpannerFieldInfo dataclass to replace usage of StructType.Field
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1. The global database_instances is moved to exec_env.py to avoid circular imports. 2. SpannerFiledInfo.typename populated with the correct name now 3. Remove all cloud spanner refs from database.py
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Commit 1:- Standardize return type for execute_query() functions
Commit 2:-
SpannerFieldInfo dataclass to replace usage of StructType.Field