Implement LOAD_FILE function

[ouyiz]

Task Description

Implement LOAD_FILE(location, filename).

Solution Description

Add a new SQL scalar function load_file that resolves a LOCATION, reads a local file:// file, and returns the file content as a binary string/BLOB.

Passed Regressions

Local macOS build is blocked by toolchain compatibility. Submitted to GitHub Action for official validation.

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[LINxiansheng]

Document AI & IK Custom Dictionary Score

Document AI Functions Score
===========================
score: 100.00 / 100
load_file: 50 / 50
ai_split_document: 50 / 50

IK Custom Dictionary Score
==========================
score: 100.00 / 100
ik_custom_dict: 100 / 100

FTS Large Benchmark Score

FTS Large Benchmark Score
=========================
score: 0.00 / 100
mean_improvement: -74.07%
full_score_improvement: 50.00%

build_improvement: -9.94%
  build_ik_all_sec: baseline=35.2836, current=40.276, improvement=-14.15%
  build_ik_content_sec: baseline=28.3764, current=33.31, improvement=-17.39%
  build_beng_en_sec: baseline=14.7578, current=14.504, improvement=1.72%
tokenize_improvement: 6.32%
  tokenize_ik_avg_ms: baseline=0.76478, current=0.6945, improvement=9.19%
  tokenize_beng_avg_ms: baseline=0.42262, current=0.408, improvement=3.46%
query_improvement: -218.59%
  query_cn_avg_ms: baseline=16.6628, current=130.518, improvement=-683.29%
  query_beng_avg_ms: baseline=24.3042, current=24.0929, improvement=0.87%
  query_mixed_avg_ms: baseline=17.5593, current=31.3596, improvement=-78.59%
  query_limit_avg_ms: baseline=16.2334, current=34.6347, improvement=-113.35%

FTS Large Benchmark Report

========================================
FTS Large Benchmark Report
========================================
timestamp:              2026-07-15 11:13:06
label:                  vldb-ci-29409571705-1
git_head:               60dbd40
git_dirty:              0
rows:                   20000
batch:                  500
rounds:                 3000
query_rounds:           200
samples:                3
warmup:                 30
skip_load:              0
----------------------------------------
select1_avg_ms:         0.2036
select1_stdev_ms:       0.0012
raw_load_sec:           1.465
raw_load_rows_per_sec:  13651.9
build_ik_all_sec:       40.276
build_ik_content_sec:   33.310
build_beng_en_sec:      14.504
build_total_sec:        88.103
----------------------------------------
tokenize_ik_avg_ms:     0.6945
tokenize_ik_median_ms:  0.6954
tokenize_ik_stdev_ms:   0.0012
tokenize_beng_avg_ms:   0.4080
tokenize_beng_median_ms:0.4084
tokenize_beng_stdev_ms: 0.0009
----------------------------------------
query_cn_hits:          20000
query_cn_avg_ms:        130.5182
query_cn_stdev_ms:      0.0514
query_beng_hits:        11000
query_beng_avg_ms:      24.0929
query_beng_stdev_ms:    0.0063
query_mixed_hits:       9998
query_mixed_avg_ms:     31.3596
query_mixed_stdev_ms:   0.0127
query_limit_hits:       20
query_limit_avg_ms:     34.6347
query_limit_stdev_ms:   0.0241
========================================

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