ptupitsyn commented on a change in pull request #455:
URL: https://github.com/apache/ignite-3/pull/455#discussion_r760940470
##########
File path:
modules/api/src/main/java/org/apache/ignite/table/mapper/DefaultColumnMapper.java
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@@ -21,7 +21,7 @@
import org.jetbrains.annotations.NotNull;
/**
- * Simple mapper implementation that map a column to a class field.
+ * Mapper implementation which maps object fields to the columns by their
names.
Review comment:
I think we should have two-way mapping, column -> field and field ->
column.
We know the schema on the client side (column names and their order). We
don't know defaults for now, but I don't think they are required.
It should be easy to write the row in correct order from an object if we
have `column -> field` mapping:
```
for (var col : schema.columns()) {
var fieldName = mapper.fieldForColumn(col.name());
if (fieldName == null)
packNil();
else
packValue(...);
}
```
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