paryoja

### What is the context for this pull request? Draft of the spec documentation. ### What changes were proposed in this pull request? Documentation is added. ### Does this PR...

Change the quick guide with Spark Exetension use cases

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### What is the context for this pull request? - **Tracking Issue**: #503 - **Dependencies**: #504 ### What changes were proposed in this pull request? According to the use case...

Some functions are just copied and used across test files. How about extracting them as a trait? It could be done separately or in this PR. _Originally posted by @clee704...

### Describe the issue I made an index using data path from "abfss://..../my_data". And executed a query using spark.sql(). Index was not applied to the query even though it is...

[FEATURE REQUEST]: Create helper function to check whether index is actually used in the plan

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**Feature requested** I need a function to check whether Spark actually used an index I intended to use. It could be helpful to understand the behavior of hyperspace indexes and...