[PR] perf(rest): avoid unused partition metadata maps [iceberg-go]

["fallintoplace (via GitHub)" <gi...@apache.org>]

fallintoplace opened a new pull request, #2119:
URL: https://github.com/apache/iceberg-go/pull/2119

   ## What
   - Remove unused partition metadata allocations in the REST scan decoder.
   
   ## Why
   - `NewDataFileBuilder` ignores fixed-size metadata.
   - Primitive and null partition values do not need logical-type metadata.
   
   ## Implementation
   - Pass `nil` for fixed sizes and create the logical-type map only when needed.
   - Keep partition values and logical types for data and delete files.
   - Add a primitive partition benchmark and coverage for null, fixed, date, decimal, UUID and unpartitioned values.
   
   **Benchmarks:** 1,024 data tasks per operation. Mixed partitions use integer/date/fixed; primitive partitions use integer/string/fixed.
   
   | Partitions | ns/op, base → head | B/op, base → head | allocs/op, base → head |
   | --- | ---: | ---: | ---: |
   | Mixed | 4,278,023 → 4,173,623 | 5,161,315 → 5,112,099 | 37,894 → 36,870 |
   | Primitive | 4,030,529 → 3,434,114 | 4,768,080 → 4,620,560 | 35,846 → 32,774 |
   
   **1,024 fewer allocations** for mixed partitions; **3,072 fewer** for primitive partitions. Times varied between samples; allocation counts were stable.
   
   Go 1.26.3, darwin/arm64, Apple M1 Pro. Median of 7 samples, 1s each, CPU=1. Base `fa5309b3624d5798bde69722b279366bb7f39846`, head `f37470c6e5996fa40274154d272eaaa67f7a0f0e`. The same benchmark file was used on both revisions.
   
   ```sh
   go test ./catalog/rest -run '^$' -bench '^(BenchmarkDecodeScanTasks|BenchmarkDecodeScanTasksPrimitivePartitions)$/^1024_tasks$' -benchmem -benchtime=1s -count=7 -cpu=1
   ```
   


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Re: [PR] perf(rest): avoid unused partition metadata maps [iceberg-go]

["zeroshade (via GitHub)" <gi...@apache.org>]

zeroshade merged PR #2119:
URL: https://github.com/apache/iceberg-go/pull/2119


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Re: [PR] perf(rest): avoid unused partition metadata maps [iceberg-go]

["zeroshade (via GitHub)" <gi...@apache.org>]

zeroshade commented on code in PR #2119:
URL: https://github.com/apache/iceberg-go/pull/2119#discussion_r4198583354


##########
catalog/rest/scan_task_partition_metadata_bench_test.go:
##########
@@ -0,0 +1,76 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package rest
+
+import (
+	"encoding/json"
+	"fmt"
+	"testing"
+
+	"github.com/apache/iceberg-go"
+)
+
+func BenchmarkDecodeScanTasksPrimitivePartitions(b *testing.B) {

Review Comment:
   Nit: both benchmarks in this file are copies of `BenchmarkDecodeScanTasks` in `scan_task_decoder_bench_test.go`, differing only in the spec/partition setup. Folding them into that benchmark as a partition-shape dimension (mixed / primitive / all-null × task count) keeps the decode benchmarks in the file that matches `scan_task_decoder.go`, avoids three copies of the same loop across two files, and keeps base-vs-PR comparisons under one benchmark name.



##########
catalog/rest/scan_task_decoder_test.go:
##########
@@ -740,12 +741,11 @@ func TestPartitionDecodePlanKeepsValuesIndependent(t *testing.T) {
 	assert.Equal(t, []byte("ABCD"), second[1002])
 	firstLogical[1001] = "changed"
 	assert.NotContains(t, secondLogical, 1001)
-	firstFixed[1002] = 99
-	assert.NotContains(t, secondFixed, 1002)
+	assert.Nil(t, secondLogical)

Review Comment:
   Nit: with the lazy map, `secondLogical` is always nil for this input (its date is `null`), so mutating `firstLogical` and then checking `NotContains` can't detect aliasing anymore and is redundant with the `assert.Nil` below. Asserting the first map's contents is a more useful check here:
   
   ```suggestion
   	assert.Equal(t, map[int]string{1001: atype.Date}, firstLogical)
   	assert.Nil(t, secondLogical)
   ```



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