When working with Room, a powerful persistence library in Android, you might encounter warnings about unused columns in your query results. These warnings can be a bit daunting, but they are actually quite helpful in optimizing your app’s performance. In this article, we will explore how to handle these warnings and ensure your Room queries are as efficient as possible.

The Problem

Consider the following warning message:

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/Users/guanyc/StudioProjects/BornWinClean/app/build/tmp/kapt3/stubs/debug/com/guanyc/stock/discipline/data/local/dao/StockNoteDao.java:118:
warning: The query returns some columns
[color, isCompleted, hasUnplannedAction, reviewMarket, string1, string2, string3, string4, string5, b1, b2, b3, b4, b5, i1, i2, i3, i4, i5, f1, f2, f3, f4, f5]
which are not used by com.guanyc.stock.discipline.presentation.main.MainViewModel.StockNotePanelPojo.
You can use @ColumnInfo annotation on the fields to specify the mapping.
You can annotate the method with @RewriteQueriesToDropUnusedColumns
to direct Room to rewrite your query to avoid fetching unused columns.

You can suppress this warning by annotating the method with @SuppressWarnings(RoomWarnings.CURSOR_MISMATCH).
Columns returned by the query: stockNoteId, createDate, color, isCompleted, hasUnplannedAction,
reviewMarket, string1, string2, string3, string4, string5,
b1, b2, b3, b4, b5, i1, i2, i3, i4, i5, f1, f2, f3, f4, f5.

This warning from Room indicates that your query is retrieving columns that are not actually used in the StockNotePanelPojo class. Room offers a few solutions for handling this:

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