From 22c5d361607ad82e9951e8ccb013f1c1c81cdfa1 Mon Sep 17 00:00:00 2001
From: Wes McKinney <wes.mckinney@twosigma.com>
Date: Sat, 30 Sep 2017 19:46:36 -0500
Subject: [PATCH] Address a couple more infer warnings

Change-Id: Ib30ff3d4784983342eca31405b8916dd4474be03
---
 cpp/src/arrow/array.h                  | 2 +-
 cpp/src/arrow/ipc/reader.cc            | 1 -
 cpp/src/arrow/python/numpy_to_arrow.cc | 5 +++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/cpp/src/arrow/array.h b/cpp/src/arrow/array.h
index ee29d95068276..4ad60eb77f48e 100644
--- a/cpp/src/arrow/array.h
+++ b/cpp/src/arrow/array.h
@@ -84,7 +84,7 @@ struct Decimal;
 /// input array and replace them with newly-allocated data, changing the output
 /// data type as well.
 struct ARROW_EXPORT ArrayData {
-  ArrayData() {}
+  ArrayData() : length(0) {}
 
   ArrayData(const std::shared_ptr<DataType>& type, int64_t length,
             int64_t null_count = kUnknownNullCount, int64_t offset = 0)
diff --git a/cpp/src/arrow/ipc/reader.cc b/cpp/src/arrow/ipc/reader.cc
index 09def6ea6ed4b..7ab8b92d9f40e 100644
--- a/cpp/src/arrow/ipc/reader.cc
+++ b/cpp/src/arrow/ipc/reader.cc
@@ -349,7 +349,6 @@ Status ReadDictionary(const Buffer& metadata, const DictionaryTypeMap& dictionar
       reinterpret_cast<const flatbuf::RecordBatch*>(dictionary_batch->data());
   RETURN_NOT_OK(
       ReadRecordBatch(batch_meta, dummy_schema, kMaxNestingDepth, file, &batch));
-
   if (batch->num_columns() != 1) {
     return Status::Invalid("Dictionary record batch must only contain one field");
   }
diff --git a/cpp/src/arrow/python/numpy_to_arrow.cc b/cpp/src/arrow/python/numpy_to_arrow.cc
index 37e85fc485bd1..2eb9de9dd1680 100644
--- a/cpp/src/arrow/python/numpy_to_arrow.cc
+++ b/cpp/src/arrow/python/numpy_to_arrow.cc
@@ -1220,8 +1220,9 @@ Status NdarrayToArrow(MemoryPool* pool, PyObject* ao, PyObject* mo,
                       std::shared_ptr<ChunkedArray>* out) {
   NumPyConverter converter(pool, ao, mo, type, use_pandas_null_sentinels);
   RETURN_NOT_OK(converter.Convert());
-  DCHECK(converter.result()[0]);
-  *out = std::make_shared<ChunkedArray>(converter.result());
+  const auto& output_arrays = converter.result();
+  DCHECK_GT(output_arrays.size(), 0);
+  *out = std::make_shared<ChunkedArray>(output_arrays);
   return Status::OK();
 }