[arrow] branch main updated: GH-35167: [Docs][C++] Use new API for arrow::json::TableReader (#37301)

[kou]

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The following commit(s) were added to refs/heads/main by this push:
     new 7c1e71c6b6 GH-35167: [Docs][C++] Use new API for 
arrow::json::TableReader (#37301)
7c1e71c6b6 is described below

commit 7c1e71c6b672e606a0f5aaa513251dd2c3ef0648
Author: Rajat Subhra Mukherjee <raromukher...@gmail.com>
AuthorDate: Wed Aug 23 13:10:27 2023 +0530

    GH-35167: [Docs][C++] Use new API for arrow::json::TableReader (#37301)
    
    ### Rationale for this change
    
    The current document causes a build error.
    
    ### What changes are included in this PR?
    
    Use the current API.
    
    ### Are these changes tested?
    
    No.
    
    ### Are there any user-facing changes?
    
    Yes.
    
    * Closes: #35167
    
    Lead-authored-by: Rajat Subhra Mukherjee <raromukher...@gmail.com>
    Co-authored-by: Will Jones <willjones...@gmail.com>
    Signed-off-by: Sutou Kouhei <k...@clear-code.com>
---
 docs/source/cpp/json.rst | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/docs/source/cpp/json.rst b/docs/source/cpp/json.rst
index 003e768529..3e49c045c8 100644
--- a/docs/source/cpp/json.rst
+++ b/docs/source/cpp/json.rst
@@ -49,7 +49,6 @@ the output table.
 
    {
       // ...
-      arrow::Status st;
       arrow::MemoryPool* pool = default_memory_pool();
       std::shared_ptr<arrow::io::InputStream> input = ...;
 
@@ -57,20 +56,19 @@ the output table.
       auto parse_options = arrow::json::ParseOptions::Defaults();
 
       // Instantiate TableReader from input stream and options
-      std::shared_ptr<arrow::json::TableReader> reader;
-      st = arrow::json::TableReader::Make(pool, input, read_options,
-                                          parse_options, &reader);
-      if (!st.ok()) {
+      auto maybe_reader = arrow::json::TableReader::Make(pool, input, 
read_options, parse_options);
+      if (!maybe_reader.ok()) {
          // Handle TableReader instantiation error...
       }
+      auto reader = *maybe_reader;
 
-      std::shared_ptr<arrow::Table> table;
       // Read table from JSON file
-      st = reader->Read(&table);
-      if (!st.ok()) {
+      auto maybe_table = reader->Read();
+      if (!maybe_table.ok()) {
          // Handle JSON read error
          // (for example a JSON syntax error or failed type conversion)
       }
+      auto table = *maybe_table;
    }
 
 StreamingReader