SparkOfflineStore doesn't work with delta format

[nboyarkin]

I was trying to use SparkOfflineStore with delta formatted files, but got the error while "feast apply":
TypeError("Comparisons should only involve FileSource class objects.")

In the traceback I see that there is a attempt to compare self.batch_source == other.batch_source, there batch_source is supposed to be a valid format for FileSource like 'csv' or 'parquet', so, it doesn't work with delta.

Initial settings for the feature store

• Yaml file:
  project: feast
  registry:
  path: s3://bucket-name/registry.pb
  offline_store:
  type: spark
  spark_conf:
  spark.master: "local[*]"
  spark.ui.enabled: "false"
  spark.eventLog.enabled: "false"
  spark.sql.parser.quotedRegexColumnNames: "true"
  spark.sql.session.timeZone: "UTC"
  spark.sql.execution.arrow.fallback.enabled: "true"
  spark.sql.execution.arrow.pyspark.enabled: "true"
  spark.sql.catalog.spark_catalog: "org.apache.spark.sql.delta.catalog.DeltaCatalog"
  spark.sql.extensions: "io.delta.sql.DeltaSparkSessionExtension"
  spark.hadoop.fs.s3a.impl: "org.apache.hadoop.fs.s3a.S3AFileSystem"
  spark.hadoop.fs.s3.impl: org.apache.hadoop.fs.s3a.S3AFileSystem
  spark.databricks.delta.retentionDurationCheck.enabled: "false"
  spark.hadoop.fs.s3a.endpoint: "https://storage.yandexcloud.net"
  spark.hadoop.fs.s3a.aws.credentials.provider: "org.apache.hadoop.fs.s3a.SimpleAWSCredentialsProvider"
  spark.jars.packages: "io.delta:delta-core_2.12:2.3.0,org.apache.hadoop:hadoop-aws:3.3.4,com.amazonaws:aws-java-sdk-bundle:1.12.348"
  online_store: null
  provider: local

• feature definition in repo:
  calendar_source_delta_test = SparkSource(
  file_format='delta',
  name="calendar_enconded_source_delta_test",
  path="s3://bucket-name/features/calendar_delta_test/",
  timestamp_field="event_timestamp",
  created_timestamp_column="created",
  )

calendar_fv_delta_test = FeatureView(
name="calendar_stats_delta_test",
entities=[store, product],
ttl=timedelta(days=7),
schema=[
Field(name="year", dtype=Float64),
Field(name="month", dtype=Float64),
Field(name="week", dtype=Float64),
Field(name="quarter", dtype=Float64),
],
online=False,
source=calendar_source_delta_test
)

• Error traceback:
  Traceback (most recent call last):
  File "/home/nboyarkin/miniconda3/envs/feast_env/bin/feast", line 8, in
  sys.exit(cli())
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/click/core.py", line 1161, in call
  return self.main(*args, **kwargs)
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/click/core.py", line 1082, in main
  rv = self.invoke(ctx)
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/click/core.py", line 1697, in invoke
  return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/click/core.py", line 1443, in invoke
  return ctx.invoke(self.callback, **ctx.params)
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/click/core.py", line 788, in invoke
  return __callback(*args, **kwargs)
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/click/decorators.py", line 33, in new_func
  return f(get_current_context(), *args, **kwargs)
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/feast/cli.py", line 778, in apply_total_command
  apply_total(repo_config, repo, skip_source_validation)
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/feast/repo_operations.py", line 405, in apply_total
  apply_total_with_repo_instance(
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/feast/repo_operations.py", line 352, in apply_total_with_repo_instance
  store.apply(all_to_apply, objects_to_delete=all_to_delete, partial=False)
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/feast/feature_store.py", line 951, in apply
  self._registry.apply_feature_view(view, project=self.project, commit=False)
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/feast/infra/registry/registry.py", line 462, in apply_feature_view
  feature_view.class.from_proto(existing_feature_view_proto)
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/feast/feature_view.py", line 244, in eq
  if not super().eq(other):
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/feast/base_feature_view.py", line 160, in eq
  or self.projection != other.projection
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/attr/_make.py", line 1583, in ne
  result = self.eq(other)
  File "", line 13, in eq
  self.batch_source == other.batch_source
  File "/home/nboyarkin/miniconda3/envs/feast_env/lib/python3.9/site-packages/feast/infra/offline_stores/file_source.py", line 93, in eq
  raise TypeError("Comparisons should only involve FileSource class objects.")
  TypeError: Comparisons should only involve FileSource class objects.

• Version: 0.46