GujaLomsadze commented on code in PR #50646:
URL: https://github.com/apache/arrow/pull/50646#discussion_r3681479630
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python/pyarrow/ipc.pxi:
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@@ -1192,6 +1192,39 @@ cdef class _RecordBatchFileReader(_Weakrefable):
"""
return self.reader.get().num_record_batches()
+ def count_rows(self):
+ """
+ The total number of rows in the IPC file.
+
+ This reads the metadata of each record batch in the file, without
+ deserializing the record batches themselves.
+
+ Returns
+ -------
+ count : int
+
+ Examples
+ --------
+ >>> import pyarrow as pa
+ >>> schema = pa.schema([('a', pa.int64())])
+ >>> sink = pa.BufferOutputStream()
+ >>> with pa.ipc.new_file(sink, schema) as writer:
+ ... for i in range(3):
+ ... writer.write_batch(pa.record_batch([[1, 2]],
schema=schema))
+ >>> with pa.ipc.open_file(sink.getvalue()) as reader:
+ ... reader.count_rows()
+ 6
+ """
+ cdef int64_t nrows
+
+ if not self.reader:
+ raise ValueError("Operation on closed reader")
+
Review Comment:
Good catch, removed. I copied it from the `stats` property, but that check
only makes sense on the stream reader, which has a `close()` that resets
`self.reader`. Check will never hit here, File reader has no close(). Thanks!
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