samredai opened a new pull request #4318:
URL: https://github.com/apache/iceberg/pull/4318
This adds the Schema class by carving it out of PR #3228 by @nssalian and
building upon it.
A `Schema` object is created by providing a list of `NestedField` instances,
a schema ID, and optionally a map of aliases to field IDs. The
`get_field_id(...)` method allows you to retrieve a field ID by providing the
field name or an alias, and the `get_field(...)` method allows you to retrieve
the field object by providing the field ID. There's also a `get_type` method
that lets you retrieve the type of field by providing the field ID.
```py
from iceberg.table.schema import Schema
from iceberg.types import BooleanType, IntegerType, NestedField, StringType
fields = [
NestedField(field_id=1, name="foo", field_type=StringType(),
is_optional=False),
NestedField(field_id=2, name="bar", field_type=IntegerType(),
is_optional=True),
NestedField(field_id=3, name="baz", field_type=BooleanType(),
is_optional=False),
]
table_schema = Schema(fields=fields, schema_id=1, aliases={"qux": 3})
print(table_schema)
```
output
```
1: name=foo, type=string, required=True
2: name=bar, type=int, required=False
3: name=baz, type=boolean, required=True
```
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