unexpected error when starting core changefeed with parquet format

[stevendanna]

Describe the problem

> create table t (pk int primary key, v decimal); 
> create changefeed for t with  format = 'parquet';                                                                                                                                                                                                         
ERROR: internal error: Expected a sink with encoder for, found *changefeedccl.bufferSink
SQLSTATE: XX000
DETAIL: stack trace:
github.com/cockroachdb/cockroach/pkg/ccl/changefeedccl/sink.go:497: EncodeAndEmitRow()
github.com/cockroachdb/cockroach/pkg/ccl/changefeedccl/event_processing.go:481: encodeForParquet()
github.com/cockroachdb/cockroach/pkg/ccl/changefeedccl/event_processing.go:425: encodeAndEmit()
github.com/cockroachdb/cockroach/pkg/ccl/changefeedccl/event_processing.go:379: ConsumeEvent()
github.com/cockroachdb/cockroach/pkg/ccl/changefeedccl/changefeed_processors.go:770: tick()
github.com/cockroachdb/cockroach/pkg/ccl/changefeedccl/changefeed_processors.go:696: Next()
github.com/cockroachdb/cockroach/pkg/ccl/changefeedccl/changefeed_processors.go:1466: Next()
github.com/cockroachdb/cockroach/pkg/sql/execinfra/base.go:198: Run()
github.com/cockroachdb/cockroach/pkg/sql/execinfra/processorsbase.go:732: Run()
github.com/cockroachdb/cockroach/pkg/sql/flowinfra/flow.go:579: Run()
github.com/cockroachdb/cockroach/pkg/sql/distsql_running.go:928: Run()
github.com/cockroachdb/cockroach/pkg/ccl/changefeedccl/changefeed_dist.go:328: func1()
github.com/cockroachdb/cockroach/pkg/util/ctxgroup/ctxgroup.go:168: func1()
golang.org/x/sync/errgroup/external/org_golang_x_sync/errgroup/errgroup.go:78: func1()
src/runtime/asm_arm64.s:1222: goexit()

HINT: You have encountered an unexpected error.

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Jira issue: CRDB-42304

Epic CRDB-41786

[blathers-crl[bot]]

Hi @stevendanna, please add branch-* labels to identify which branch(es) this C-bug affects.

_{:owl: Hoot! I am a Blathers, a bot for CockroachDB. My owner is dev-inf.}

[blathers-crl[bot]]

cc @cockroachdb/cdc

[rharding6373]

We only support parquet with [cloud] storage, so we don't expect this to work for core changefeeds. We should make sure this fails with a good error message during validation.

[kaustubhbabar5]

Hii, I would like to work on this

[kaustubhbabar5]

We only support parquet with [cloud] storage, so we don't expect this to work for core changefeeds. We should make sure this fails with a good error message during validation.

As parquet is only supported for cloud storage sink. I think we should not allow creating sinkless changefeed with format = 'parquet' option irrespective of whether it's core or enterprise changefeed