Use TableInfo instead of TableDescriptor for created table

[wuchong]

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Motivation

Currently, many instances rely on TableDescriptor to retrieve table metadata, such as bucket keys, bucket numbers, and primary keys. However, because TableDescriptor is primarily designed for table creation, extracting metadata from it can be cumbersome, as numerous fields are optional. This often leads to lengthy method chains like tableInfo.getTableDescriptor().getTableDistribution().get().getBucketCount().get() just to obtain a bucket number. This approach not only complicates the code but also generates multiple IDE warnings due to forced retrieval from Optionals. It's important to note that once a table is created, it will always have a defined bucket number.

Solution

This issue aims to streamline the process by exclusively using TableInfo to access the metadata of a created table. We will introduce several useful getters to significantly simplify the code, making it more efficient and readable.

Anything else?

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Willingness to contribute

• I'm willing to submit a PR!