Coalesce batches inside FilterExec #18604

Dandandan · 2025-11-11T07:30:35Z

Which issue does this PR close?

Closes: Integrate Batch coalescing inside FilterExec #18606
Relates to: Improve RepartitionExec for better query performance #7001

Rationale for this change

Moe coalesce batches inside filter exec. We can use BatchCoalescer ::push_batch_with_filter which should give a speed up compared to filtering individual batches + concatenating afterwards.

What changes are included in this PR?

Changes the FilterExec to coalesce batches inside.
I did not make a change to remove CoalesceBatchesExec from all the plans, I plan to create an issue and a PR after this is merged to do so.
Now it should be mostly a no-op with limited overhead as input batches are already well-sized.

Are these changes tested?

Are there any user-facing changes?

Dandandan · 2025-11-11T08:00:53Z

@alamb could you run some benchmarks?

…datafusion into coalesce_batches_filter

alamb · 2025-11-11T11:15:56Z

🤖 ./gh_compare_branch.sh Benchmark Script Running
Linux aal-dev 6.14.0-1018-gcp #19~24.04.1-Ubuntu SMP Wed Sep 24 23:23:09 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Comparing coalesce_batches_filter (4386c68) to 9029ff1 diff using: tpch_mem clickbench_partitioned clickbench_extended
Results will be posted here when complete

alamb

Looks very nice 👌 I kicked off some benchmarks so let's see how that goes

alamb · 2025-11-11T11:17:21Z

datafusion/physical-plan/src/filter.rs

+                    continue;
+                }
+                None => {
+                    self.batch_coalescer.finish_buffered_batch().unwrap();


I think we should probably check for the error here rather than unwrapping

alamb · 2025-11-11T12:16:09Z

🤖: Benchmark completed

Details

Comparing HEAD and coalesce_batches_filter
--------------------
Benchmark clickbench_extended.json
--------------------
┏━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━┓
┃ Query        ┃        HEAD ┃ coalesce_batches_filter ┃    Change ┃
┡━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━┩
│ QQuery 0     │  2691.53 ms │              2659.32 ms │ no change │
│ QQuery 1     │  1253.57 ms │              1225.87 ms │ no change │
│ QQuery 2     │  2337.37 ms │              2365.69 ms │ no change │
│ QQuery 3     │  1212.27 ms │              1178.42 ms │ no change │
│ QQuery 4     │  2320.18 ms │              2315.67 ms │ no change │
│ QQuery 5     │ 28101.95 ms │             28087.34 ms │ no change │
│ QQuery 6     │  4054.98 ms │              4040.75 ms │ no change │
│ QQuery 7     │  3658.92 ms │              3553.58 ms │ no change │
└──────────────┴─────────────┴─────────────────────────┴───────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━┓
┃ Benchmark Summary                      ┃            ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━┩
│ Total Time (HEAD)                      │ 45630.78ms │
│ Total Time (coalesce_batches_filter)   │ 45426.64ms │
│ Average Time (HEAD)                    │  5703.85ms │
│ Average Time (coalesce_batches_filter) │  5678.33ms │
│ Queries Faster                         │          0 │
│ Queries Slower                         │          0 │
│ Queries with No Change                 │          8 │
│ Queries with Failure                   │          0 │
└────────────────────────────────────────┴────────────┘
--------------------
Benchmark clickbench_partitioned.json
--------------------
┏━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
┃ Query        ┃        HEAD ┃ coalesce_batches_filter ┃        Change ┃
┡━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
│ QQuery 0     │     2.46 ms │                 2.65 ms │  1.08x slower │
│ QQuery 1     │    49.87 ms │                49.22 ms │     no change │
│ QQuery 2     │   137.03 ms │               138.01 ms │     no change │
│ QQuery 3     │   163.67 ms │               160.12 ms │     no change │
│ QQuery 4     │  1043.67 ms │              1207.21 ms │  1.16x slower │
│ QQuery 5     │  1485.47 ms │              1527.46 ms │     no change │
│ QQuery 6     │     2.20 ms │                 2.13 ms │     no change │
│ QQuery 7     │    53.74 ms │                57.35 ms │  1.07x slower │
│ QQuery 8     │  1447.65 ms │              1536.81 ms │  1.06x slower │
│ QQuery 9     │  1813.05 ms │              1978.63 ms │  1.09x slower │
│ QQuery 10    │   377.10 ms │               372.54 ms │     no change │
│ QQuery 11    │   419.98 ms │               430.20 ms │     no change │
│ QQuery 12    │  1342.22 ms │              1475.60 ms │  1.10x slower │
│ QQuery 13    │  2120.69 ms │              2203.66 ms │     no change │
│ QQuery 14    │  1245.76 ms │              1331.51 ms │  1.07x slower │
│ QQuery 15    │  1223.22 ms │              1302.32 ms │  1.06x slower │
│ QQuery 16    │  2697.72 ms │              2714.05 ms │     no change │
│ QQuery 17    │  2655.54 ms │              2698.10 ms │     no change │
│ QQuery 18    │  5465.26 ms │              5014.92 ms │ +1.09x faster │
│ QQuery 19    │   127.98 ms │               130.55 ms │     no change │
│ QQuery 20    │  2048.52 ms │              1989.80 ms │     no change │
│ QQuery 21    │  2372.60 ms │              2343.35 ms │     no change │
│ QQuery 22    │  3980.08 ms │              3992.99 ms │     no change │
│ QQuery 23    │ 13374.23 ms │             12881.66 ms │     no change │
│ QQuery 24    │   218.86 ms │               209.13 ms │     no change │
│ QQuery 25    │   473.30 ms │               482.03 ms │     no change │
│ QQuery 26    │   223.91 ms │               222.54 ms │     no change │
│ QQuery 27    │  2822.85 ms │              2841.47 ms │     no change │
│ QQuery 28    │ 23428.70 ms │             23252.67 ms │     no change │
│ QQuery 29    │   991.04 ms │               960.29 ms │     no change │
│ QQuery 30    │  1324.59 ms │              1354.69 ms │     no change │
│ QQuery 31    │  1393.96 ms │              1368.83 ms │     no change │
│ QQuery 32    │  4845.05 ms │              4577.94 ms │ +1.06x faster │
│ QQuery 33    │  5940.04 ms │              5771.19 ms │     no change │
│ QQuery 34    │  6245.80 ms │              5973.56 ms │     no change │
│ QQuery 35    │  2064.77 ms │              2089.54 ms │     no change │
│ QQuery 36    │   125.06 ms │               124.77 ms │     no change │
│ QQuery 37    │    52.92 ms │                53.77 ms │     no change │
│ QQuery 38    │   120.71 ms │               122.10 ms │     no change │
│ QQuery 39    │   197.44 ms │               196.82 ms │     no change │
│ QQuery 40    │    42.02 ms │                44.08 ms │     no change │
│ QQuery 41    │    39.13 ms │                38.90 ms │     no change │
│ QQuery 42    │    32.83 ms │                33.40 ms │     no change │
└──────────────┴─────────────┴─────────────────────────┴───────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━┓
┃ Benchmark Summary                      ┃            ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━┩
│ Total Time (HEAD)                      │ 96232.70ms │
│ Total Time (coalesce_batches_filter)   │ 95258.55ms │
│ Average Time (HEAD)                    │  2237.97ms │
│ Average Time (coalesce_batches_filter) │  2215.32ms │
│ Queries Faster                         │          2 │
│ Queries Slower                         │          8 │
│ Queries with No Change                 │         33 │
│ Queries with Failure                   │          0 │
└────────────────────────────────────────┴────────────┘
--------------------
Benchmark tpch_mem_sf1.json
--------------------
┏━━━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
┃ Query        ┃      HEAD ┃ coalesce_batches_filter ┃        Change ┃
┡━━━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
│ QQuery 1     │ 137.27 ms │               138.89 ms │     no change │
│ QQuery 2     │  29.24 ms │                28.40 ms │     no change │
│ QQuery 3     │  37.97 ms │                38.59 ms │     no change │
│ QQuery 4     │  29.81 ms │                29.05 ms │     no change │
│ QQuery 5     │  87.56 ms │                88.26 ms │     no change │
│ QQuery 6     │  20.04 ms │                19.77 ms │     no change │
│ QQuery 7     │ 224.05 ms │               229.62 ms │     no change │
│ QQuery 8     │  33.29 ms │                32.85 ms │     no change │
│ QQuery 9     │ 103.80 ms │               107.28 ms │     no change │
│ QQuery 10    │  64.03 ms │                64.83 ms │     no change │
│ QQuery 11    │  18.83 ms │                16.69 ms │ +1.13x faster │
│ QQuery 12    │  50.86 ms │                52.40 ms │     no change │
│ QQuery 13    │  47.28 ms │                44.90 ms │ +1.05x faster │
│ QQuery 14    │  13.84 ms │                13.97 ms │     no change │
│ QQuery 15    │  25.09 ms │                25.16 ms │     no change │
│ QQuery 16    │  24.95 ms │                25.44 ms │     no change │
│ QQuery 17    │ 148.54 ms │               151.79 ms │     no change │
│ QQuery 18    │ 282.62 ms │               279.84 ms │     no change │
│ QQuery 19    │  38.34 ms │                38.26 ms │     no change │
│ QQuery 20    │  49.08 ms │                50.09 ms │     no change │
│ QQuery 21    │ 321.30 ms │               327.13 ms │     no change │
│ QQuery 22    │  20.72 ms │                20.44 ms │     no change │
└──────────────┴───────────┴─────────────────────────┴───────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━┓
┃ Benchmark Summary                      ┃           ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━┩
│ Total Time (HEAD)                      │ 1808.52ms │
│ Total Time (coalesce_batches_filter)   │ 1823.66ms │
│ Average Time (HEAD)                    │   82.21ms │
│ Average Time (coalesce_batches_filter) │   82.89ms │
│ Queries Faster                         │         2 │
│ Queries Slower                         │         0 │
│ Queries with No Change                 │        20 │
│ Queries with Failure                   │         0 │
└────────────────────────────────────────┴───────────┘

alamb · 2025-11-11T15:50:59Z

🤖 ./gh_compare_branch.sh Benchmark Script Running
Linux aal-dev 6.14.0-1018-gcp #19~24.04.1-Ubuntu SMP Wed Sep 24 23:23:09 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Comparing coalesce_batches_filter (c11583d) to 9029ff1 diff using: tpch_mem clickbench_partitioned clickbench_extended
Results will be posted here when complete

alamb · 2025-11-11T15:51:30Z

The lack of consistency is really bugging me -- I am going to see if I can find some way to have more consistent benchmarks

alamb · 2025-11-11T16:38:03Z

🤖: Benchmark completed

Details

Comparing HEAD and coalesce_batches_filter
--------------------
Benchmark clickbench_extended.json
--------------------
┏━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
┃ Query        ┃        HEAD ┃ coalesce_batches_filter ┃        Change ┃
┡━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
│ QQuery 0     │  2642.14 ms │              2599.20 ms │     no change │
│ QQuery 1     │  1262.40 ms │              1190.50 ms │ +1.06x faster │
│ QQuery 2     │  2416.97 ms │              2337.11 ms │     no change │
│ QQuery 3     │  1210.38 ms │              1190.89 ms │     no change │
│ QQuery 4     │  2297.50 ms │              2288.48 ms │     no change │
│ QQuery 5     │ 28265.49 ms │             28202.83 ms │     no change │
│ QQuery 6     │  4085.13 ms │              4058.92 ms │     no change │
│ QQuery 7     │  3573.53 ms │              3606.53 ms │     no change │
└──────────────┴─────────────┴─────────────────────────┴───────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━┓
┃ Benchmark Summary                      ┃            ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━┩
│ Total Time (HEAD)                      │ 45753.53ms │
│ Total Time (coalesce_batches_filter)   │ 45474.45ms │
│ Average Time (HEAD)                    │  5719.19ms │
│ Average Time (coalesce_batches_filter) │  5684.31ms │
│ Queries Faster                         │          1 │
│ Queries Slower                         │          0 │
│ Queries with No Change                 │          7 │
│ Queries with Failure                   │          0 │
└────────────────────────────────────────┴────────────┘
--------------------
Benchmark clickbench_partitioned.json
--------------------
┏━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━┓
┃ Query        ┃        HEAD ┃ coalesce_batches_filter ┃        Change ┃
┡━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━┩
│ QQuery 0     │     2.54 ms │                 2.55 ms │     no change │
│ QQuery 1     │    49.83 ms │                50.92 ms │     no change │
│ QQuery 2     │   136.99 ms │               135.65 ms │     no change │
│ QQuery 3     │   164.01 ms │               164.64 ms │     no change │
│ QQuery 4     │  1056.37 ms │              1063.00 ms │     no change │
│ QQuery 5     │  1455.77 ms │              1531.93 ms │  1.05x slower │
│ QQuery 6     │     2.16 ms │                 2.17 ms │     no change │
│ QQuery 7     │    55.59 ms │                55.77 ms │     no change │
│ QQuery 8     │  1469.91 ms │              1465.92 ms │     no change │
│ QQuery 9     │  1875.69 ms │              1775.66 ms │ +1.06x faster │
│ QQuery 10    │   370.91 ms │               371.31 ms │     no change │
│ QQuery 11    │   431.72 ms │               432.71 ms │     no change │
│ QQuery 12    │  1338.02 ms │              1370.48 ms │     no change │
│ QQuery 13    │  2082.60 ms │              2151.20 ms │     no change │
│ QQuery 14    │  1253.94 ms │              1283.32 ms │     no change │
│ QQuery 15    │  1218.88 ms │              1240.67 ms │     no change │
│ QQuery 16    │  2667.64 ms │              2691.51 ms │     no change │
│ QQuery 17    │  2651.76 ms │              2683.53 ms │     no change │
│ QQuery 18    │  5403.64 ms │              5005.25 ms │ +1.08x faster │
│ QQuery 19    │   130.78 ms │               127.08 ms │     no change │
│ QQuery 20    │  2037.08 ms │              1993.61 ms │     no change │
│ QQuery 21    │  2336.77 ms │              2286.01 ms │     no change │
│ QQuery 22    │  4035.61 ms │              3968.79 ms │     no change │
│ QQuery 23    │ 17891.15 ms │             12842.71 ms │ +1.39x faster │
│ QQuery 24    │   227.55 ms │               216.66 ms │     no change │
│ QQuery 25    │   480.59 ms │               466.63 ms │     no change │
│ QQuery 26    │   218.85 ms │               213.88 ms │     no change │
│ QQuery 27    │  2874.47 ms │              2808.06 ms │     no change │
│ QQuery 28    │ 23827.66 ms │             23394.83 ms │     no change │
│ QQuery 29    │   997.09 ms │               997.10 ms │     no change │
│ QQuery 30    │  1376.95 ms │              1320.52 ms │     no change │
│ QQuery 31    │  1413.16 ms │              1392.63 ms │     no change │
│ QQuery 32    │  5318.38 ms │              4522.89 ms │ +1.18x faster │
│ QQuery 33    │  6167.75 ms │              5846.51 ms │ +1.05x faster │
│ QQuery 34    │  6174.07 ms │              6017.32 ms │     no change │
│ QQuery 35    │  2044.10 ms │              2060.33 ms │     no change │
│ QQuery 36    │   123.68 ms │               123.54 ms │     no change │
│ QQuery 37    │    51.76 ms │                53.65 ms │     no change │
│ QQuery 38    │   121.67 ms │               121.80 ms │     no change │
│ QQuery 39    │   202.62 ms │               204.62 ms │     no change │
│ QQuery 40    │    42.76 ms │                42.50 ms │     no change │
│ QQuery 41    │    39.82 ms │                40.41 ms │     no change │
│ QQuery 42    │    33.26 ms │                32.75 ms │     no change │
└──────────────┴─────────────┴─────────────────────────┴───────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┓
┃ Benchmark Summary                      ┃             ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━┩
│ Total Time (HEAD)                      │ 101855.58ms │
│ Total Time (coalesce_batches_filter)   │  94573.03ms │
│ Average Time (HEAD)                    │   2368.73ms │
│ Average Time (coalesce_batches_filter) │   2199.37ms │
│ Queries Faster                         │           5 │
│ Queries Slower                         │           1 │
│ Queries with No Change                 │          37 │
│ Queries with Failure                   │           0 │
└────────────────────────────────────────┴─────────────┘
--------------------
Benchmark tpch_mem_sf1.json
--------------------
┏━━━━━━━━━━━━━━┳━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━┓
┃ Query        ┃      HEAD ┃ coalesce_batches_filter ┃    Change ┃
┡━━━━━━━━━━━━━━╇━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━┩
│ QQuery 1     │ 140.56 ms │               137.18 ms │ no change │
│ QQuery 2     │  29.20 ms │                29.32 ms │ no change │
│ QQuery 3     │  38.93 ms │                38.67 ms │ no change │
│ QQuery 4     │  29.81 ms │                29.69 ms │ no change │
│ QQuery 5     │  87.50 ms │                88.18 ms │ no change │
│ QQuery 6     │  19.94 ms │                19.80 ms │ no change │
│ QQuery 7     │ 217.31 ms │               221.90 ms │ no change │
│ QQuery 8     │  34.71 ms │                33.63 ms │ no change │
│ QQuery 9     │  97.86 ms │               101.97 ms │ no change │
│ QQuery 10    │  64.26 ms │                64.10 ms │ no change │
│ QQuery 11    │  18.00 ms │                17.53 ms │ no change │
│ QQuery 12    │  51.96 ms │                50.71 ms │ no change │
│ QQuery 13    │  46.71 ms │                48.18 ms │ no change │
│ QQuery 14    │  13.98 ms │                14.07 ms │ no change │
│ QQuery 15    │  24.68 ms │                24.97 ms │ no change │
│ QQuery 16    │  25.44 ms │                25.25 ms │ no change │
│ QQuery 17    │ 154.66 ms │               152.63 ms │ no change │
│ QQuery 18    │ 281.57 ms │               276.58 ms │ no change │
│ QQuery 19    │  38.52 ms │                38.92 ms │ no change │
│ QQuery 20    │  48.75 ms │                49.09 ms │ no change │
│ QQuery 21    │ 305.96 ms │               317.17 ms │ no change │
│ QQuery 22    │  20.50 ms │                20.94 ms │ no change │
└──────────────┴───────────┴─────────────────────────┴───────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━┓
┃ Benchmark Summary                      ┃           ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━┩
│ Total Time (HEAD)                      │ 1790.83ms │
│ Total Time (coalesce_batches_filter)   │ 1800.46ms │
│ Average Time (HEAD)                    │   81.40ms │
│ Average Time (coalesce_batches_filter) │   81.84ms │
│ Queries Faster                         │         0 │
│ Queries Slower                         │         0 │
│ Queries with No Change                 │        22 │
│ Queries with Failure                   │         0 │
└────────────────────────────────────────┴───────────┘

alamb

Looks very nice 👌 I kicked off some benchmarks

I don't think they show super meaningful improvements, but it doesn't hurt, so 👍 from me

Thanks @Dandandan

Dandandan · 2025-11-11T17:24:16Z

Hm interesting.

I realize now push_batch_with_filter doesn't do any optimizations, so it makes sense it doesn't do much better than CoalesceBatches yet.

But there is some more potential, and we can remove the CoalesceBatches from the plan afterwards!

Dandandan added 2 commits November 10, 2025 16:21

wip

983b4bf

Config batch size

9028e34

github-actions bot added core Core DataFusion crate physical-plan Changes to the physical-plan crate labels Nov 11, 2025

Dandandan added 3 commits November 11, 2025 08:31

fmt

eb28688

Bring back timer

ca4ebf2

fix

0bff717

Dandandan added 6 commits November 11, 2025 09:02

Merge branch 'main' into coalesce_batches_filter

be6e492

Refactor

f1b3d24

Merge branch 'coalesce_batches_filter' of github.com:Dandandan/arrow-…

601bf12

…datafusion into coalesce_batches_filter

Refactor

f71d1db

Refactor

2a3b4ef

clippy

4386c68

alamb reviewed Nov 11, 2025

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Dandandan added 3 commits November 11, 2025 12:29

Handle error

02e7582

Improve comments

a64e8ef

Simplify

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alamb approved these changes Nov 11, 2025

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Dandandan added this pull request to the merge queue Nov 11, 2025

Merged via the queue into apache:main with commit 65bd13d Nov 11, 2025
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Dandandan mentioned this pull request Nov 12, 2025

Remove FilterExec from CoalesceBatches optimization rule #18646

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Coalesce batches inside FilterExec #18604

Coalesce batches inside FilterExec #18604

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Coalesce batches inside FilterExec #18604

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