Ext3h commented on code in PR #48192:
URL: https://github.com/apache/arrow/pull/48192#discussion_r2546811701


##########
cpp/src/arrow/util/compression_zstd.cc:
##########
@@ -207,8 +226,18 @@ class ZSTDCodec : public Codec {
 
   Result<int64_t> Compress(int64_t input_len, const uint8_t* input,
                            int64_t output_buffer_len, uint8_t* output_buffer) 
override {
-    size_t ret = ZSTD_compress(output_buffer, 
static_cast<size_t>(output_buffer_len),
-                               input, static_cast<size_t>(input_len), 
compression_level_);
+    if (!compression_context_) {

Review Comment:
   And there's a weird mismatch in the `Compressor` interface - it does not 
support context/state-recycling even though all of the backing interfaces 
actually do. It always assumes that the context/state would be dead after a 
single compression pass.



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