xr-chen commented on PR #766:
URL: https://github.com/apache/incubator-xtable/pull/766#issuecomment-3641625135
The problem is actually more complicated than fixing the fieldId generation;
the data file written by column mapping enabled doesn't follow the table schema
at all. We need to somehow map the columns in the data files to the columns in
the schema.
```
root
|-- col-4ee2e8c9-35f1-4868-8ff5-46d285fac4b2: integer (nullable = true)
|-- col-89424a5c-1fbc-4f97-b9dc-c3bf90f9849e: string (nullable = true)
|-- col-0c385cbd-8f94-4043-bb55-89f07a39a2bb: string (nullable = true)
```
mapping info in the delta table
```
[
{
"name": "id",
"type": "integer",
"nullable": false,
"metadata": {
"delta.columnMapping.id": 1,
"delta.columnMapping.physicalName":
"col-4ee2e8c9-35f1-4868-8ff5-46d285fac4b2"
}
},
{
"name": "firstName",
"type": "string",
"nullable": true,
"metadata": {
"delta.columnMapping.id": 2,
"delta.columnMapping.physicalName":
"col-89424a5c-1fbc-4f97-b9dc-c3bf90f9849e"
}
},
{
"name": "lastName",
"type": "string",
"nullable": true,
"metadata": {
"delta.columnMapping.id": 3,
"delta.columnMapping.physicalName":
"col-0c385cbd-8f94-4043-bb55-89f07a39a2bb"
}
}
]
```
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