Add nullability inference support to dataframe-jdbc

Kotlin / dataframe

Structured data processing in Kotlin

https://kotlin.github.io/dataframe/overview.html

Apache License 2.0

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Add nullability inference support to dataframe-jdbc #672

Closed zaleslaw closed 5 months ago

zaleslaw commented 5 months ago

This update adds a new parameter inferNullability for various dataframe reading functions including readSqlTable, readSqlQuery, and readResultSet. It allows better control over how column nullability should be inferred. The h2Test file has been adjusted to test this new feature.

Fixes #541