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๐ŸŒ Add LLM Translations (#2352)
* Add LLM Translations V2 ## โœ… Translated to Simplified-Chinese - 1 directory (8 files) | **Source** | **Output/Count** | **Language** | | :--- | :--- | :--- | | ๐Ÿ“ `docs/en/guides/55-performance/` | 8 files | Simplified-Chinese | | `docs/en/guides/55-performance/02-aggregating-index.md` | `docs/cn/guides/55-performance/02-aggregating-index.md` | Simplified-Chinese | | `docs/en/guides/55-performance/query-result-cache.md` | `docs/cn/guides/55-performance/query-result-cache.md` | Simplified-Chinese | | `docs/en/guides/55-performance/01-virtual-column.md` | `docs/cn/guides/55-performance/01-virtual-column.md` | Simplified-Chinese | | `docs/en/guides/55-performance/_category_.json` | `docs/cn/guides/55-performance/_category_.json` | Simplified-Chinese | | `docs/en/guides/55-performance/03-fulltext-index.md` | `docs/cn/guides/55-performance/03-fulltext-index.md` | Simplified-Chinese | | `docs/en/guides/55-performance/00-cluster-key.md` | `docs/cn/guides/55-performance/00-cluster-key.md` | Simplified-Chinese | | `docs/en/guides/55-performance/index.md` | `docs/cn/guides/55-performance/index.md` | Simplified-Chinese | | `docs/en/guides/55-performance/ngram-index.md` | `docs/cn/guides/55-performance/ngram-index.md` | Simplified-Chinese | * Update index.md --------- Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Bohu <[email protected]>
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โ€Ždocs/cn/guides/55-performance/00-cluster-key.mdโ€Ž

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title: Cluster Key
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# ่š็ฐ‡้”ฎ (Cluster Key): ่‡ชๅŠจๆ•ฐๆฎ็ป„็ป‡ไปฅๅŠ ้€ŸๆŸฅ่ฏข
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# Cluster Key๏ผš่‡ชๅŠจๆ•ฐๆฎ็ป„็ป‡ๅŠ ้€ŸๆŸฅ่ฏข
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่š็ฐ‡้”ฎ (cluster key) ๆไพ›่‡ชๅŠจๆ•ฐๆฎ็ป„็ป‡ๅŠŸ่ƒฝ๏ผŒๅฏๆ˜พ่‘—ๆ้ซ˜ๅคงๅž‹่กจ็š„ๆŸฅ่ฏขๆ€ง่ƒฝใ€‚Databend ๅœจๅŽๅฐๆ— ็ผไธ”ๆŒ็ปญๅœฐ็ฎก็†ๆ‰€ๆœ‰่š็ฐ‡ๆ“ไฝœโ€”โ€”ๆ‚จๅช้œ€ๅฎšไน‰่š็ฐ‡้”ฎ๏ผŒDatabend ๅฐฑไผšๅค„็†ๅ…ถไฝ™็š„ๅทฅไฝœใ€‚
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Cluster Key ๆไพ›่‡ชๅŠจๆ•ฐๆฎ็ป„็ป‡ๅŠŸ่ƒฝ๏ผŒๆ˜พ่‘—ๆๅ‡ๅคงๅž‹่กจ็š„ๆŸฅ่ฏขๆ€ง่ƒฝใ€‚Databend ๅœจๅŽๅฐๆ— ็ผๆŒ็ปญ็ฎก็†ๆ‰€ๆœ‰้›†็พคๆ“ไฝœ - ๆ‚จๅช้œ€ๅฎšไน‰ Cluster Key๏ผŒDatabend ่‡ชๅŠจๅค„็†ๅŽ็ปญๅทฅไฝœใ€‚
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## ่งฃๅ†ณไบ†ไป€ไนˆ้—ฎ้ข˜๏ผŸ
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## ่งฃๅ†ณ็š„้—ฎ้ข˜
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ๆœช็ป้€‚ๅฝ“็ป„็ป‡็š„ๅคงๅž‹่กจไผšๅธฆๆฅๆ˜พ่‘—็š„ๆ€ง่ƒฝๅ’Œ็ปดๆŠคๆŒ‘ๆˆ˜๏ผš
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็ผบไนๅˆ็†็ป„็ป‡็š„ๅคงๅž‹่กจไผšๅผ•ๅ‘ๆ˜พ่‘—็š„ๆ€ง่ƒฝๅ’Œ็ปดๆŠคๆŒ‘ๆˆ˜๏ผš
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| ้—ฎ้ข˜ | ๅฝฑๅ“ | ่‡ชๅŠจ่š็ฐ‡่งฃๅ†ณๆ–นๆกˆ |
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| ้—ฎ้ข˜ | ๅฝฑๅ“ | ่‡ชๅŠจ่š็ฑป่งฃๅ†ณๆ–นๆกˆ |
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|---------|--------|------------------------------|
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| **ๅ…จ่กจๆ‰ซๆ** | ๅณไฝฟๆ˜ฏ่ฟ‡ๆปคๅŽ็š„ๆ•ฐๆฎ๏ผŒๆŸฅ่ฏขไนŸไผš่ฏปๅ–ๆ•ดไธช่กจ | ่‡ชๅŠจ็ป„็ป‡ๆ•ฐๆฎ๏ผŒๅช่ฏปๅ–็›ธๅ…ณๆ•ฐๆฎๅ— |
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| **้šๆœบๆ•ฐๆฎ่ฎฟ้—ฎ** | ็›ธไผผๆ•ฐๆฎๅˆ†ๆ•ฃๅœจๅญ˜ๅ‚จไธญ | ๆŒ็ปญๅฐ†็›ธๅ…ณๆ•ฐๆฎๅˆ†็ป„ๅœจไธ€่ตท |
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| **ๆ…ข้€Ÿ่ฟ‡ๆปคๆŸฅ่ฏข** | WHERE ๅญๅฅๆ‰ซๆไธๅฟ…่ฆ็š„่กŒ | ่‡ชๅŠจๅฎŒๅ…จ่ทณ่ฟ‡ไธ็›ธๅ…ณ็š„ๅ— |
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| **้ซ˜ I/O ๆˆๆœฌ** | ่ฏปๅ–ๅคง้‡ๆœชไฝฟ็”จ็š„ๆ—งๆ•ฐๆฎ | ่‡ชๅŠจๆœ€ๅฐๅŒ–ๆ•ฐๆฎไผ ่พ“ |
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| **ๆ‰‹ๅŠจ็ปดๆŠค** | ้œ€่ฆ็›‘ๆŽงๅ’Œๆ‰‹ๅŠจ้‡ๆ–ฐ่š็ฐ‡่กจ | ้›ถ็ปดๆŠคโ€”โ€”่‡ชๅŠจๅŽๅฐไผ˜ๅŒ– |
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| **่ต„ๆบ็ฎก็†** | ๅฟ…้กปไธบ่š็ฐ‡ๆ“ไฝœๅˆ†้…่ฎก็ฎ—่ต„ๆบ | Databend ่‡ชๅŠจๅค„็†ๆ‰€ๆœ‰่š็ฐ‡่ต„ๆบ |
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| **ๅ…จ่กจๆ‰ซๆ** | ๆŸฅ่ฏข้œ€ๆ‰ซๆๅ…จ่กจ่Žทๅ–่ฟ‡ๆปคๆ•ฐๆฎ | ่‡ชๅŠจ็ป„็ป‡ๆ•ฐๆฎ๏ผŒไป…่ฏปๅ–็›ธๅ…ณๅ— |
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| **้šๆœบๆ•ฐๆฎ่ฎฟ้—ฎ** | ็›ธไผผๆ•ฐๆฎๅˆ†ๆ•ฃๅญ˜ๅ‚จ | ๆŒ็ปญๅฐ†็›ธๅ…ณๆ•ฐๆฎๅˆ†็ป„ๅญ˜ๅ‚จ |
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| **ๆ…ข้€Ÿ่ฟ‡ๆปคๆŸฅ่ฏข** | WHERE ๅญๅฅๆ‰ซๆๆ— ๅ…ณ่กŒ | ่‡ชๅŠจ่ทณ่ฟ‡ๆ— ๅ…ณๆ•ฐๆฎๅ— |
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| **้ซ˜ I/O ๆˆๆœฌ** | ่ฏปๅ–ๅคง้‡ๆœชไฝฟ็”จๆ•ฐๆฎ | ่‡ชๅŠจๆœ€ๅฐๅŒ–ๆ•ฐๆฎไผ ่พ“้‡ |
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| **ๆ‰‹ๅŠจ็ปดๆŠค** | ้œ€็›‘ๆŽงๅนถๆ‰‹ๅŠจ้‡่š็ฑป่กจ | ้›ถ็ปดๆŠค - ่‡ชๅŠจๅŽๅฐไผ˜ๅŒ– |
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| **่ต„ๆบ็ฎก็†** | ้œ€ไธบ่š็ฑปๆ“ไฝœๅˆ†้…่ฎก็ฎ—่ต„ๆบ | Databend ่‡ชๅŠจ็ฎก็†ๆ‰€ๆœ‰่š็ฑป่ต„ๆบ |
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**็คบไพ‹**: ไธ€ไธชๅŒ…ๅซๆ•ฐ็™พไธ‡ๅ•†ๅ“็š„็”ตๅ•†่กจใ€‚ๅฆ‚ๆžœๆฒกๆœ‰่š็ฐ‡๏ผŒๆŸฅ่ฏข `WHERE category IN ('Electronics', 'Computers')` ๅฟ…้กปๆ‰ซๆๆ‰€ๆœ‰ๅ•†ๅ“็ฑปๅˆซใ€‚้€š่ฟ‡ๆŒ‰็ฑปๅˆซ่‡ชๅŠจ่š็ฐ‡๏ผŒDatabend ไผšๆŒ็ปญๅฐ†็”ตๅญไบงๅ“ๅ’Œ็”ต่„‘ไบงๅ“ๅˆ†็ป„ๅœจไธ€่ตท๏ผŒๅชๆ‰ซๆ 2 ไธชๆ•ฐๆฎๅ—่€Œไธๆ˜ฏ 1000 ๅคšไธชๆ•ฐๆฎๅ—ใ€‚
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**็คบไพ‹**๏ผšๅซๆ•ฐ็™พไธ‡ไบงๅ“็š„็”ตๅ•†่กจใ€‚ๆœช่š็ฑปๆ—ถ๏ผŒๆŸฅ่ฏข `WHERE category IN ('Electronics', 'Computers')` ้œ€ๆ‰ซๆๆ‰€ๆœ‰ไบงๅ“็ฑปๅˆซใ€‚้€š่ฟ‡ๆŒ‰็ฑปๅˆซ่‡ชๅŠจ่š็ฑป๏ผŒDatabend ๆŒ็ปญๅฐ†็”ตๅญไบงๅ“ไธŽ่ฎก็ฎ—ๆœบไบงๅ“ๅˆ†็ป„ๅญ˜ๅ‚จ๏ผŒไป…ๆ‰ซๆ 2 ไธชๆ•ฐๆฎๅ—่€Œ้ž 1000+ ไธชๅ—ใ€‚
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## ่‡ชๅŠจ่š็ฐ‡็š„ไผ˜ๅŠฟ
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## ่‡ชๅŠจ่š็ฑปไผ˜ๅŠฟ
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**ๆ˜“ไบŽ็ปดๆŠค**: Databend ๆถˆ้™คไบ†ไปฅไธ‹้œ€ๆฑ‚๏ผš
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- ็›‘ๆŽง่š็ฐ‡่กจ็š„็Šถๆ€
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- ๆ‰‹ๅŠจ่งฆๅ‘้‡ๆ–ฐ่š็ฐ‡ๆ“ไฝœ
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- ไธบ่š็ฐ‡ๆŒ‡ๅฎš่ฎก็ฎ—่ต„ๆบ
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**็ปดๆŠคไพฟๆท**๏ผšDatabend ๆ— ้œ€๏ผš
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- ็›‘ๆŽง่š็ฑป่กจ็Šถๆ€
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- ๆ‰‹ๅŠจ่งฆๅ‘้‡่š็ฑปๆ“ไฝœ
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- ๅˆ†้…่š็ฑป่ฎก็ฎ—่ต„ๆบ
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- ๅฎ‰ๆŽ’็ปดๆŠค็ช—ๅฃ
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**ๅทฅไฝœๅŽŸ็†**: ๅฎšไน‰่š็ฐ‡้”ฎๅŽ๏ผŒDatabend ไผš่‡ชๅŠจ๏ผš
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- ็›‘ๆŽง DML ๆ“ไฝœๅผ•่ตท็š„่กจๆ›ดๆ”น
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- ่ฏ„ไผฐไฝ•ๆ—ถ้œ€่ฆ้‡ๆ–ฐ่š็ฐ‡่กจ
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- ๆ‰ง่กŒๅŽๅฐ่š็ฐ‡ไผ˜ๅŒ–
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- ๆŒ็ปญ็ปดๆŠคๆœ€ไฝณๆ•ฐๆฎ็ป„็ป‡
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**ๅทฅไฝœๅŽŸ็†**๏ผšๅฎšไน‰ Cluster Key ๅŽ๏ผŒDatabend ่‡ชๅŠจ๏ผš
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- ็›‘ๆŽง DML ๆ“ไฝœๅผ•่ตท็š„่กจๅ˜ๆ›ด
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- ่ฏ„ไผฐ่กจๆ˜ฏๅฆ้œ€้‡่š็ฑป
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- ๆ‰ง่กŒๅŽๅฐ่š็ฑปไผ˜ๅŒ–
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- ๆŒ็ปญไฟๆŒๆœ€ไผ˜ๆ•ฐๆฎ็ป„็ป‡
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ๆ‚จๆ‰€้œ€่ฆๅš็š„ๅฐฑๆ˜ฏไธบๆฏไธช่กจๅฎšไน‰ไธ€ไธช่š็ฐ‡้”ฎ (ๅฆ‚ๆžœ้€‚็”จ)๏ผŒDatabend ไผš่‡ชๅŠจ็ฎก็†ๆ‰€ๆœ‰ๆœชๆฅ็š„็ปดๆŠคใ€‚
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ๆ‚จๅช้œ€ไธบ่กจๅฎšไน‰่š็ฑป้”ฎ๏ผˆๅฆ‚้€‚็”จ๏ผ‰๏ผŒDatabend ๅฐ†่‡ชๅŠจ็ฎก็†ๆ‰€ๆœ‰ๅŽ็ปญ็ปดๆŠคใ€‚
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## ๅทฅไฝœๅŽŸ็†
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่š็ฐ‡้”ฎๆ นๆฎๆŒ‡ๅฎš็š„ๅˆ—ๅฐ†ๆ•ฐๆฎ็ป„็ป‡ๅˆฐๅญ˜ๅ‚จๅ— (Parquet ๆ–‡ไปถ) ไธญ๏ผš
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Cluster Key ๆ นๆฎๆŒ‡ๅฎšๅˆ—ๅฐ†ๆ•ฐๆฎ็ป„็ป‡ๅˆฐๅญ˜ๅ‚จๅ—๏ผˆParquet ๆ–‡ไปถ๏ผ‰ไธญ๏ผš
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![Cluster Key Visualization](/img/sql/clustered.png)
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1. **ๆ•ฐๆฎ็ป„็ป‡** โ†’ ็›ธไผผๅ€ผๅˆ†็ป„ๅˆฐ็›ธ้‚ป็š„ๆ•ฐๆฎๅ—ไธญ
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2. **ๅ…ƒๆ•ฐๆฎๅˆ›ๅปบ** โ†’ ๅญ˜ๅ‚จๅ—ๅˆฐๅ€ผ็š„ๆ˜ ๅฐ„๏ผŒ็”จไบŽๅฟซ้€ŸๆŸฅๆ‰พ
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3. **ๆŸฅ่ฏขไผ˜ๅŒ–** โ†’ ๆŸฅ่ฏขๆœŸ้—ดๅช่ฏปๅ–็›ธๅ…ณๆ•ฐๆฎๅ—
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4. **ๆ€ง่ƒฝๆๅ‡** โ†’ ๆ‰ซๆ็š„่กŒๆ•ฐๆ›ดๅฐ‘๏ผŒ็ป“ๆžœๆ›ดๅฟซ
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1. **ๆ•ฐๆฎ็ป„็ป‡** โ†’ ็›ธไผผๅ€ผๅˆ†็ป„่‡ณ็›ธ้‚ปๅ—
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2. **ๅ…ƒๆ•ฐๆฎๅˆ›ๅปบ** โ†’ ๅญ˜ๅ‚จๅ—ๅ€ผๆ˜ ๅฐ„ๅ…ณ็ณปๅฎž็Žฐๅฟซ้€ŸๆŸฅๆ‰พ
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3. **ๆŸฅ่ฏขไผ˜ๅŒ–** โ†’ ๆŸฅ่ฏขๆ—ถไป…่ฏปๅ–็›ธๅ…ณๅ—
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4. **ๆ€ง่ƒฝๆๅ‡** โ†’ ๅ‡ๅฐ‘ๆ‰ซๆ่กŒๆ•ฐ๏ผŒๅŠ ้€Ÿ็ป“ๆžœ่ฟ”ๅ›ž
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## ๅฟซ้€Ÿ่ฎพ็ฝฎ
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```sql
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-- Create table with cluster key
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-- ๅˆ›ๅปบๅธฆๆœ‰่š็ฐ‡้”ฎ็š„่กจ
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-- ๅˆ›ๅปบๅซ cluster key ็š„่กจ
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CREATE TABLE sales (
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order_id INT,
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order_date TIMESTAMP,
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region VARCHAR,
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amount DECIMAL
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) CLUSTER BY (region);
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-- Or add cluster key to existing table
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-- ๆˆ–่€…ไธบ็Žฐๆœ‰่กจๆทปๅŠ ่š็ฐ‡้”ฎ
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-- ไธบ็Žฐๆœ‰่กจๆทปๅŠ  cluster key
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ALTER TABLE sales CLUSTER BY (region, order_date);
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```
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## ้€‰ๆ‹ฉๆญฃ็กฎ็š„่š็ฐ‡้”ฎ
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## ้€‰ๆ‹ฉๅˆ้€‚ Cluster Key
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ๆ นๆฎๆ‚จๆœ€ๅธธ่ง็š„ๆŸฅ่ฏข่ฟ‡ๆปคๅ™จ้€‰ๆ‹ฉๅˆ—๏ผš
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ๆ นๆฎๅธธ็”จๆŸฅ่ฏข่ฟ‡ๆปคๆกไปถ้€‰ๆ‹ฉๅˆ—๏ผš
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| ๆŸฅ่ฏขๆจกๅผ | ๆŽจ่็š„่š็ฐ‡้”ฎ | ็คบไพ‹ |
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| ๆŸฅ่ฏขๆจกๅผ | ๆŽจ่ Cluster Key | ็คบไพ‹ |
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|---------------|------------------------|---------|
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| ๆŒ‰ๅ•ๅˆ—่ฟ‡ๆปค | ่ฏฅๅˆ— | `CLUSTER BY (region)` |
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| ๆŒ‰ๅคšๅˆ—่ฟ‡ๆปค | ๅคšๅˆ— | `CLUSTER BY (region, category)` |
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| ๅ•ๅˆ—่ฟ‡ๆปค | ่ฏฅๅˆ— | `CLUSTER BY (region)` |
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| ๅคšๅˆ—่ฟ‡ๆปค | ๅคšๅˆ—็ป„ๅˆ | `CLUSTER BY (region, category)` |
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| ๆ—ฅๆœŸ่Œƒๅ›ดๆŸฅ่ฏข | ๆ—ฅๆœŸ/ๆ—ถ้—ดๆˆณๅˆ— | `CLUSTER BY (order_date)` |
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| ้ซ˜ๅŸบๆ•ฐๅˆ— | ไฝฟ็”จ่กจ่พพๅผๅ‡ๅฐ‘ๅ€ผ | `CLUSTER BY (DATE(created_at))` |
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| ้ซ˜ๅŸบๆ•ฐๅˆ— | ไฝฟ็”จ่กจ่พพๅผ้™ๅŸบ | `CLUSTER BY (DATE(created_at))` |
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### ๅฅฝ็š„่š็ฐ‡้”ฎ vs ๅ็š„่š็ฐ‡้”ฎ
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### ไผ˜ๅŠฃ Cluster Key ๅฏนๆฏ”
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| โœ… ๅฅฝ็š„้€‰ๆ‹ฉ | โŒ ๅทฎ็š„้€‰ๆ‹ฉ |
79+
| โœ… ไผ˜้€‰ๆ–นๆกˆ | โŒ ๅŠฃ้€‰ๆ–นๆกˆ |
8280
|----------------|----------------|
83-
| ้ข‘็น่ฟ‡ๆปค็š„ๅˆ— | ๅพˆๅฐ‘ไฝฟ็”จ็š„ๅˆ— |
84-
| ไธญ็ญ‰ๅŸบๆ•ฐ (100-10K ไธชๅ€ผ) | ๅธƒๅฐ”ๅˆ— (ๅ€ผๅคชๅฐ‘) |
85-
| ๆ—ฅๆœŸ/ๆ—ถ้—ดๅˆ— | ๅ”ฏไธ€ ID ๅˆ— (ๅ€ผๅคชๅคš) |
86-
| ๅŒบๅŸŸใ€็ฑปๅˆซใ€็Šถๆ€ | ้šๆœบๆˆ–ๅ“ˆๅธŒๅˆ— |
81+
| ้ซ˜้ข‘่ฟ‡ๆปคๅˆ— | ไฝŽ้ข‘ไฝฟ็”จๅˆ— |
82+
| ไธญๅŸบๆ•ฐ๏ผˆ100-10K ๅ€ผ๏ผ‰ | ๅธƒๅฐ”ๅˆ—๏ผˆๅ–ๅ€ผ่ฟ‡ๅฐ‘๏ผ‰ |
83+
| ๆ—ฅๆœŸ/ๆ—ถ้—ดๅˆ— | ๅ”ฏไธ€ ID ๅˆ—๏ผˆๅ–ๅ€ผ่ฟ‡ๅคš๏ผ‰ |
84+
| ๅŒบๅŸŸ/็ฑปๅˆซ/็Šถๆ€ๅˆ— | ้šๆœบๆˆ–ๅ“ˆๅธŒๅˆ— |
8785

88-
## ็›‘ๆŽงๆ€ง่ƒฝ
86+
## ๆ€ง่ƒฝ็›‘ๆŽง
8987

9088
```sql
91-
-- Check clustering effectiveness
92-
-- ๆฃ€ๆŸฅ่š็ฐ‡ๆ•ˆๆžœ
89+
-- ๆฃ€ๆŸฅ่š็ฑปๆ•ˆๆžœ
9390
SELECT * FROM clustering_information('database_name', 'table_name');
9491

95-
-- Key metrics to watch:
9692
-- ๅ…ณ้”ฎๆŒ‡ๆ ‡๏ผš
97-
-- average_depth: Lower is better (< 2 ideal)
98-
-- average_depth: ่ถŠไฝŽ่ถŠๅฅฝ (็†ๆƒณๆƒ…ๅ†ต < 2)
99-
-- average_overlaps: Lower is better
100-
-- average_overlaps: ่ถŠไฝŽ่ถŠๅฅฝ
101-
-- block_depth_histogram: More blocks at depth 1-2
102-
-- block_depth_histogram: ๆ›ดๅคšๆ•ฐๆฎๅ—ๅœจๆทฑๅบฆ 1-2
93+
-- average_depth: ๅ€ผ่ถŠไฝŽ่ถŠๅฅฝ๏ผˆ<2 ไธบไผ˜๏ผ‰
94+
-- average_overlaps: ๅ€ผ่ถŠไฝŽ่ถŠๅฅฝ
95+
-- block_depth_histogram: ๆทฑๅบฆ 1-2 ็š„ๅ—ๅ ๆฏ”่ถŠ้ซ˜่ถŠๅฅฝ
10396
```
10497

105-
## ไฝ•ๆ—ถ้‡ๆ–ฐ่š็ฐ‡
98+
## ้‡่š็ฑปๆ—ถๆœบ
10699

107-
้š็€ๆ•ฐๆฎๅ˜ๅŒ–๏ผŒ่กจไผš้š็€ๆ—ถ้—ดๅ˜ๅพ—ๆ— ๅบ๏ผš
100+
ๆ•ฐๆฎๅ˜ๆ›ดไผšๅฏผ่‡ด่กจ้€ๆธๅคฑๅบ๏ผš
108101

109102
```sql
110-
-- Check if re-clustering is needed
111-
-- ๆฃ€ๆŸฅๆ˜ฏๅฆ้œ€่ฆ้‡ๆ–ฐ่š็ฐ‡
103+
-- ๆฃ€ๆŸฅๆ˜ฏๅฆ้œ€้‡่š็ฑป
112104
SELECT IF(average_depth > 2 * LEAST(GREATEST(total_block_count * 0.001, 1), 16),
113105
'Re-cluster needed',
114106
'Clustering is good')
115107
FROM clustering_information('your_database', 'your_table');
116108

117-
-- Re-cluster the table
118-
-- ้‡ๆ–ฐ่š็ฐ‡่กจ
109+
-- ้‡่š็ฑปๆ“ไฝœ
119110
ALTER TABLE your_table RECLUSTER;
120111
```
121112

122113
## ๆ€ง่ƒฝ่ฐƒไผ˜
123114

124-
### ่‡ชๅฎšไน‰ๆ•ฐๆฎๅ—ๅคงๅฐ
125-
่ฐƒๆ•ดๆ•ฐๆฎๅ—ๅคงๅฐไปฅ่Žทๅพ—ๆ›ดๅฅฝ็š„ๆ€ง่ƒฝ๏ผš
115+
### ่‡ชๅฎšไน‰ๅ—ๅคงๅฐ
116+
่ฐƒๆ•ดๅ—ๅคงๅฐไผ˜ๅŒ–ๆ€ง่ƒฝ๏ผš
126117

127118
```sql
128-
-- Smaller blocks = fewer rows per query
129-
-- ๆ›ดๅฐ็š„ๆ•ฐๆฎๅ— = ๆฏๆฌกๆŸฅ่ฏข็š„่กŒๆ•ฐๆ›ดๅฐ‘
119+
-- ่พƒๅฐๅ— = ๅ•ๆฌกๆŸฅ่ฏขๅค„็†่กŒๆ•ฐๆ›ดๅฐ‘
130120
ALTER TABLE sales SET OPTIONS(
131121
ROW_PER_BLOCK = 100000,
132122
BLOCK_SIZE_THRESHOLD = 52428800
133123
);
134124
```
135125

136-
### ่‡ชๅŠจ้‡ๆ–ฐ่š็ฐ‡
137-
- `COPY INTO` ๅ’Œ `REPLACE INTO` ไผš่‡ชๅŠจ่งฆๅ‘้‡ๆ–ฐ่š็ฐ‡
138-
- ๅฎšๆœŸ็›‘ๆŽง่š็ฐ‡ๆŒ‡ๆ ‡
139-
- ๅฝ“ `average_depth` ่ฟ‡้ซ˜ๆ—ถ้‡ๆ–ฐ่š็ฐ‡
126+
### ่‡ชๅŠจ้‡่š็ฑป
127+
- `COPY INTO` ๅ’Œ `REPLACE INTO` ่‡ชๅŠจ่งฆๅ‘้‡่š็ฑป
128+
- ๅฎšๆœŸ็›‘ๆŽง่š็ฑปๆŒ‡ๆ ‡
129+
- ๅฝ“ `average_depth` ่ฟ‡้ซ˜ๆ—ถๆ‰ง่กŒ้‡่š็ฑป
140130

141131
## ๆœ€ไฝณๅฎž่ทต
142132

143-
| ๅฎž่ทต | ็›Šๅค„ |
133+
| ๅฎž่ทตๆ–นๆกˆ | ไผ˜ๅŠฟ |
144134
|----------|---------|
145-
| **ไปŽ็ฎ€ๅ•ๅผ€ๅง‹** | ้ฆ–ๅ…ˆไฝฟ็”จๅ•ๅˆ—่š็ฐ‡้”ฎ |
135+
| **ไปŽ็ฎ€ๅผ€ๅง‹** | ไผ˜ๅ…ˆไฝฟ็”จๅ•ๅˆ— Cluster Key |
146136
| **็›‘ๆŽงๆŒ‡ๆ ‡** | ๅฎšๆœŸๆฃ€ๆŸฅ clustering_information |
147-
| **ๆต‹่ฏ•ๆ€ง่ƒฝ** | ๅœจ่š็ฐ‡ๅ‰ๅŽๆต‹้‡ๆŸฅ่ฏข้€Ÿๅบฆ |
148-
| **ๅฎšๆœŸ้‡ๆ–ฐ่š็ฐ‡** | ๆ•ฐๆฎๆ›ดๆ”นๅŽไฟๆŒ่š็ฐ‡ |
149-
| **่€ƒ่™‘ๆˆๆœฌ** | ่š็ฐ‡ไผšๆถˆ่€—่ฎก็ฎ—่ต„ๆบ |
137+
| **ๆ€ง่ƒฝๆต‹่ฏ•** | ๅฏนๆฏ”่š็ฑปๅ‰ๅŽๆŸฅ่ฏข้€Ÿๅบฆ |
138+
| **ๅฎšๆœŸ้‡่š็ฑป** | ๆ•ฐๆฎๅ˜ๆ›ดๅŽ็ปดๆŠค่š็ฑป็Šถๆ€ |
139+
| **ๆˆๆœฌ่€ƒ้‡** | ่š็ฑปๆถˆ่€—่ฎก็ฎ—่ต„ๆบ |
150140

151141
## ้‡่ฆ่ฏดๆ˜Ž
152142

153143
:::tip
154-
**ไฝ•ๆ—ถไฝฟ็”จ่š็ฐ‡้”ฎ:**
155-
- ๅคงๅž‹่กจ (ๆ•ฐ็™พไธ‡่กŒไปฅไธŠ)
156-
- ๆŸฅ่ฏขๆ€ง่ƒฝๆ…ข
157-
- ้ข‘็นๅŸบไบŽ่ฟ‡ๆปคๅ™จ็š„ๆŸฅ่ฏข
144+
**้€‚็”จๅœบๆ™ฏ๏ผš**
145+
- ๅคงๅž‹่กจ๏ผˆ็™พไธ‡+่กŒ๏ผ‰
146+
- ๆŸฅ่ฏขๆ€ง่ƒฝไฝŽไธ‹
147+
- ้ซ˜้ข‘่ฟ‡ๆปคๆŸฅ่ฏข
158148
- ๅˆ†ๆžๅž‹ๅทฅไฝœ่ดŸ่ฝฝ
159149

160-
**ไฝ•ๆ—ถไธไฝฟ็”จ:**
150+
**ไธ้€‚็”จๅœบๆ™ฏ๏ผš**
161151
- ๅฐๅž‹่กจ
162152
- ้šๆœบ่ฎฟ้—ฎๆจกๅผ
163-
- ้ข‘็นๆ›ดๆ”น็š„ๆ•ฐๆฎ
153+
- ๆ•ฐๆฎๅ˜ๆ›ด้ข‘็น
164154
:::
165155

166156
---
167157

168-
*่š็ฐ‡้”ฎๅœจๅ…ทๆœ‰ๅฏ้ข„ๆต‹่ฟ‡ๆปคๆจกๅผ็š„ๅคงๅž‹ใ€้ข‘็นๆŸฅ่ฏข็š„่กจไธŠๆœ€ๆœ‰ๆ•ˆใ€‚ไปŽๆ‚จๆœ€ๅธธ่ง็š„ WHERE ๅญๅฅๅˆ—ๅผ€ๅง‹ใ€‚*
158+
*Cluster Key ๅœจๅ…ทๆœ‰ๅฏ้ข„ๆต‹่ฟ‡ๆปคๆจกๅผ็š„ๅคงๅž‹้ซ˜้ข‘ๆŸฅ่ฏข่กจไธŠๆ•ˆๆžœๆœ€ไฝณใ€‚ๅปบ่ฎฎไปŽๆœ€ๅธธๅ‡บ็Žฐๅœจ WHERE ๅญๅฅ็š„ๅˆ—ๅผ€ๅง‹ๅฎžๆ–ฝใ€‚*

โ€Ždocs/cn/guides/55-performance/01-virtual-column.mdโ€Ž

Lines changed: 28 additions & 28 deletions
Original file line numberDiff line numberDiff line change
@@ -1,59 +1,59 @@
11
---
2-
title: Virtual Column
2+
title: ่™šๆ‹Ÿๅˆ—
33
---
44

5-
# ่™šๆ‹Ÿๅˆ—๏ผšJSON ๆ•ฐๆฎ็š„่‡ชๅŠจๅŠ ้€Ÿ
5+
# ่™šๆ‹Ÿๅˆ—๏ผšJSON ๆ•ฐๆฎ่‡ชๅŠจๅŠ ้€Ÿ
66

77
import EEFeature from '@site/src/components/EEFeature';
88

99
<EEFeature featureName='VIRTUAL COLUMN'/>
1010

11-
่™šๆ‹Ÿๅˆ— (Virtual Column) ่‡ชๅŠจๅŠ ้€Ÿๅฏนๅญ˜ๅ‚จๅœจ [VARIANT](/sql/sql-reference/data-types/variant) ๅˆ—ไธญ็š„ๅŠ็ป“ๆž„ๅŒ–ๆ•ฐๆฎ็š„ๆŸฅ่ฏขใ€‚ๆญคๅŠŸ่ƒฝไธบ JSON ๆ•ฐๆฎ่ฎฟ้—ฎๆไพ›ไบ†**้›ถ้…็ฝฎ็š„ๆ€ง่ƒฝไผ˜ๅŒ–**ใ€‚
11+
่™šๆ‹Ÿๅˆ—่‡ชๅŠจๅŠ ้€Ÿๅญ˜ๅ‚จๅœจ [VARIANT](/sql/sql-reference/data-types/variant) ๅˆ—ไธญ็š„ๅŠ็ป“ๆž„ๅŒ–ๆ•ฐๆฎๆŸฅ่ฏข๏ผŒไธบ JSON ๆ•ฐๆฎ่ฎฟ้—ฎๆไพ›**้›ถ้…็ฝฎๆ€ง่ƒฝไผ˜ๅŒ–**ใ€‚
1212

1313
## ่งฃๅ†ณไบ†ไป€ไนˆ้—ฎ้ข˜๏ผŸ
1414

15-
ๆŸฅ่ฏข JSON ๆ•ฐๆฎๆ—ถ๏ผŒไผ ็ปŸๆ•ฐๆฎๅบ“ๅœจๆฏๆฌก่ฎฟ้—ฎๅตŒๅฅ—ๅญ—ๆฎตๆ—ถ้ƒฝๅฟ…้กป่งฃๆžๆ•ดไธช JSON ็ป“ๆž„ใ€‚่ฟ™ไผš้€ ๆˆๆ€ง่ƒฝ็“ถ้ขˆ๏ผš
15+
ๆŸฅ่ฏข JSON ๆ•ฐๆฎๆ—ถ๏ผŒไผ ็ปŸๆ•ฐๆฎๅบ“ๆฏๆฌก่ฎฟ้—ฎๅตŒๅฅ—ๅญ—ๆฎต้ƒฝ้œ€่งฃๆžๆ•ดไธช JSON ็ป“ๆž„๏ผŒๅฏผ่‡ดๆ€ง่ƒฝ็“ถ้ขˆ๏ผš
1616

1717
| ้—ฎ้ข˜ | ๅฝฑๅ“ | ่™šๆ‹Ÿๅˆ—่งฃๅ†ณๆ–นๆกˆ |
1818
|---------|--------|------------------------|
19-
| **ๆŸฅ่ฏขๅปถ่ฟŸ** | ๅคๆ‚็š„ JSON ๆŸฅ่ฏข้œ€่ฆๆ•ฐ็ง’ | ไบš็ง’็บงๅ“ๅบ”ๆ—ถ้—ด |
20-
| **่ฟ‡ๅบฆๆ•ฐๆฎ่ฏปๅ–** | ๅณไฝฟๅช่ฏปๅ–ๅ•ไธชๅญ—ๆฎตไนŸๅฟ…้กป่ฏปๅ–ๆ•ดไธช JSON ๆ–‡ๆกฃ | ๅช่ฏปๅ–ๆ‰€้œ€็š„็‰นๅฎšๅญ—ๆฎต |
21-
| **JSON ่งฃๆž็ผ“ๆ…ข** | ๆฏๆฌกๆŸฅ่ฏข้ƒฝ้‡ๆ–ฐ่งฃๆžๆ•ดไธช JSON ๆ–‡ๆกฃ | ้ข„็‰ฉๅŒ–ๅญ—ๆฎตไปฅๅฎž็Žฐๅณๆ—ถ่ฎฟ้—ฎ |
22-
| **CPU ไฝฟ็”จ็Ž‡้ซ˜** | JSON ้ๅŽ†ๆถˆ่€—ๅค„็†่ƒฝๅŠ› | ๅƒๅธธ่ง„ๆ•ฐๆฎไธ€ๆ ท็›ดๆŽฅ่ฏปๅ–ๅˆ— |
23-
| **ๅ†…ๅญ˜ๅผ€้”€** | ๅฐ†ๅฎŒๆ•ด็š„ JSON ็ป“ๆž„ๅŠ ่ฝฝๅˆฐๅ†…ๅญ˜ไธญ | ๅชๅŠ ่ฝฝๆ‰€้œ€ๅญ—ๆฎต |
19+
| **ๆŸฅ่ฏขๅปถ่ฟŸ** | ๅคๆ‚ JSON ๆŸฅ่ฏข่€—ๆ—ถๆ•ฐ็ง’ | ไบš็ง’็บงๅ“ๅบ”ๆ—ถ้—ด |
20+
| **ๆ•ฐๆฎ่ฏปๅ–่ฟ‡ๅคš** | ๅณไฝฟๅช้œ€ๅ•ไธชๅญ—ๆฎตไนŸ่ฏปๅ–ๆ•ดไธชๆ–‡ๆกฃ | ไป…่ฏปๅ–ๆ‰€้œ€ๅญ—ๆฎต |
21+
| **JSON ่งฃๆž็ผ“ๆ…ข** | ๆฏๆฌกๆŸฅ่ฏข้ƒฝ้‡ๆ–ฐ่งฃๆžๅฎŒๆ•ดๆ–‡ๆกฃ | ้ข„็‰ฉๅŒ–ๅญ—ๆฎตๅฎž็Žฐๅณๆ—ถ่ฎฟ้—ฎ |
22+
| **CPU ไฝฟ็”จ็Ž‡้ซ˜** | JSON ้ๅŽ†ๆถˆ่€—ๅคง้‡็ฎ—ๅŠ› | ๅƒๅธธ่ง„ๆ•ฐๆฎ็›ดๆŽฅ่ฏปๅ– |
23+
| **ๅ†…ๅญ˜ๅผ€้”€ๅคง** | ๅŠ ่ฝฝๅฎŒๆ•ด JSON ็ป“ๆž„ๅˆฐๅ†…ๅญ˜ | ไป…ๅŠ ่ฝฝๅฟ…่ฆๅญ—ๆฎต |
2424

25-
**็คบไพ‹ๅœบๆ™ฏ**๏ผšไธ€ไธช็”ตๅ•†ๅˆ†ๆž่กจ๏ผŒๅ…ถไธญๅŒ…ๅซ JSON ๆ ผๅผ็š„ไบงๅ“ๆ•ฐๆฎใ€‚ๅฆ‚ๆžœๆฒกๆœ‰่™šๆ‹Ÿๅˆ—๏ผŒๆŸฅ่ฏขๆ•ฐ็™พไธ‡่กŒไธญ็š„ `product_data['category']` ้œ€่ฆ่งฃๆžๆฏไธช JSON ๆ–‡ๆกฃใ€‚ๆœ‰ไบ†่™šๆ‹Ÿๅˆ—๏ผŒๅฎƒๅฐฑๅ˜ๆˆไบ†็›ดๆŽฅ็š„ๅˆ—ๆŸฅๆ‰พใ€‚
25+
**็คบไพ‹ๅœบๆ™ฏ**๏ผš็”ตๅ•†ๅˆ†ๆž่กจๅญ˜ๅ‚จ JSON ๆ ผๅผไบงๅ“ๆ•ฐๆฎใ€‚ๆ— ่™šๆ‹Ÿๅˆ—ๆ—ถ๏ผŒๆŸฅ่ฏขๆ•ฐ็™พไธ‡่กŒ็š„ `product_data['category']` ้œ€่งฃๆžๆฏไธช JSON ๆ–‡ๆกฃ๏ผ›ไฝฟ็”จ่™šๆ‹Ÿๅˆ—ๅŽๅ˜ไธบ็›ดๆŽฅๅˆ—ๆŸฅๆ‰พใ€‚
2626

27-
## ่‡ชๅŠจๅทฅไฝœๅŽŸ็†
27+
## ๅทฅไฝœๅŽŸ็†
2828

2929
1. **ๆ•ฐๆฎๆ‘„ๅ–** โ†’ Databend ๅˆ†ๆž VARIANT ๅˆ—ไธญ็š„ JSON ็ป“ๆž„
30-
2. **ๆ™บ่ƒฝๆฃ€ๆต‹** โ†’ ็ณป็ปŸ่ฏ†ๅˆซ้ข‘็น่ฎฟ้—ฎ็š„ๅตŒๅฅ—ๅญ—ๆฎต
30+
2. **ๆ™บ่ƒฝๆฃ€ๆต‹** โ†’ ่ฏ†ๅˆซ้ซ˜้ข‘่ฎฟ้—ฎ็š„ๅตŒๅฅ—ๅญ—ๆฎต
3131
3. **ๅŽๅฐไผ˜ๅŒ–** โ†’ ่‡ชๅŠจๅˆ›ๅปบ่™šๆ‹Ÿๅˆ—
32-
4. **ๆŸฅ่ฏขๅŠ ้€Ÿ** โ†’ ๆŸฅ่ฏข่‡ชๅŠจไฝฟ็”จไผ˜ๅŒ–่ทฏๅพ„
32+
4. **ๆŸฅ่ฏขๅŠ ้€Ÿ** โ†’ ่‡ชๅŠจไฝฟ็”จไผ˜ๅŒ–่ทฏๅพ„
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34-
![Virtual Column Workflow](/img/sql/virtual-column.png)
34+
![่™šๆ‹Ÿๅˆ—ๅทฅไฝœๆต็จ‹](/img/sql/virtual-column.png)
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## ้…็ฝฎ
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```sql
39-
-- ๅฏ็”จ่ฏฅๅŠŸ่ƒฝ๏ผˆๅฎž้ชŒๆ€ง๏ผ‰
39+
-- ๅฏ็”จๅŠŸ่ƒฝ๏ผˆๅฎž้ชŒๆ€ง๏ผ‰
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SET enable_experimental_virtual_column = 1;
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-- ๅฏ้€‰๏ผšๆŽงๅˆถ่‡ชๅŠจๅˆทๆ–ฐ่กŒไธบ
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SET enable_refresh_virtual_column_after_write = 1; -- ้ป˜่ฎค๏ผšๅฏ็”จ
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SET enable_refresh_virtual_column_after_write = 1; -- ้ป˜่ฎคๅฏ็”จ
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```
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## ๅฎŒๆ•ด็คบไพ‹
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ๆญค็คบไพ‹ๆผ”็คบไบ†่™šๆ‹Ÿๅˆ—็š„่‡ชๅŠจๅˆ›ๅปบๅ’Œๆ€ง่ƒฝไผ˜ๅŠฟ๏ผš
48+
ๆผ”็คบ่‡ชๅŠจ่™šๆ‹Ÿๅˆ—ๅˆ›ๅปบไธŽๆ€ง่ƒฝไผ˜ๅŠฟ๏ผš
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```sql
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SET enable_experimental_virtual_column=1;
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-- ๅˆ›ๅปบไธ€ไธชๅไธบ 'test' ็š„่กจ๏ผŒๅŒ…ๅซ 'id'๏ผˆๆ•ดๅž‹๏ผ‰ๅ’Œ 'val'๏ผˆVariant ็ฑปๅž‹๏ผ‰ๅˆ—ใ€‚
53+
-- ๅˆ›ๅปบ่กจ 'test'๏ผŒๅซๆ•ดๅž‹ id ๅˆ—ๅ’Œ Variant ็ฑปๅž‹ val ๅˆ—
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CREATE TABLE test(id int, val variant);
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-- ๅ‘ 'test' ่กจๆ’ๅ…ฅๅŒ…ๅซ Variant ๆ•ฐๆฎ็š„็คบไพ‹่ฎฐๅฝ•ใ€‚
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-- ๆ’ๅ…ฅๅซ Variant ๆ•ฐๆฎ็š„็คบไพ‹่ฎฐๅฝ•
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INSERT INTO
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test
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VALUES
@@ -84,7 +84,7 @@ INSERT INTO test SELECT * FROM test;
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INSERT INTO test SELECT * FROM test;
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INSERT INTO test SELECT * FROM test;
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-- ่งฃ้‡ŠไปŽ่กจไธญ้€‰ๆ‹ฉ็‰นๅฎšๅญ—ๆฎต็š„ๆŸฅ่ฏขๆ‰ง่กŒ่ฎกๅˆ’ใ€‚
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-- ่งฃ้‡ŠๆŸฅ่ฏข็‰นๅฎšๅญ—ๆฎต็š„ๆ‰ง่กŒ่ฎกๅˆ’
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EXPLAIN
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SELECT
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val ['name'],
@@ -109,7 +109,7 @@ Exchange
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โ”œโ”€โ”€ virtual columns: [val['name'], val['pricings'][0]['type'], val['tags'][0]]
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โ””โ”€โ”€ estimated rows: 160.00
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-- ่งฃ้‡ŠไปŽ่กจไธญไป…้€‰ๆ‹ฉ 'name' ๅญ—ๆฎต็š„ๆŸฅ่ฏขๆ‰ง่กŒ่ฎกๅˆ’ใ€‚
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-- ่งฃ้‡Šไป…ๆŸฅ่ฏข name ๅญ—ๆฎต็š„ๆ‰ง่กŒ่ฎกๅˆ’
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EXPLAIN
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SELECT
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val ['name']
@@ -132,7 +132,7 @@ Exchange
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โ”œโ”€โ”€ virtual columns: [val['name']]
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โ””โ”€โ”€ estimated rows: 160.00
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-- ๆ˜พ็คบๆ‰€ๆœ‰่‡ชๅŠจ็”Ÿๆˆ็š„่™šๆ‹Ÿๅˆ—ใ€‚
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-- ๆ˜พ็คบๆ‰€ๆœ‰่‡ชๅŠจ็”Ÿๆˆ็š„่™šๆ‹Ÿๅˆ—
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SHOW VIRTUAL COLUMNS WHERE table='test';
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โ•ญโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ•ฎ
@@ -160,12 +160,12 @@ SHOW VIRTUAL COLUMNS WHERE table='test';
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## ๆ€ง่ƒฝ็ป“ๆžœ
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่™šๆ‹Ÿๅˆ—้€šๅธธๆไพ›๏ผš
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- JSON ๅญ—ๆฎต่ฎฟ้—ฎ้€Ÿๅบฆ**ๅฟซ 5-10 ๅ€**
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- **ๆ— ้œ€ๆ›ดๆ”นๆŸฅ่ฏข**ๅณๅฏๅฎž็Žฐ่‡ชๅŠจไผ˜ๅŒ–
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- ๆŸฅ่ฏขๅค„็†ๆœŸ้—ด**่ต„ๆบๆถˆ่€—้™ไฝŽ**
167-
- ๅฏน็Žฐๆœ‰ๅบ”็”จ็จ‹ๅบ็š„**้€ๆ˜ŽๅŠ ้€Ÿ**
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่™šๆ‹Ÿๅˆ—ๆไพ›๏ผš
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- **5-10 ๅ€** JSON ๅญ—ๆฎต่ฎฟ้—ฎๅŠ ้€Ÿ
165+
- **่‡ชๅŠจไผ˜ๅŒ–**๏ผŒๆ— ้œ€ไฟฎๆ”นๆŸฅ่ฏข
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- **้™ไฝŽๆŸฅ่ฏขๅค„็†่ต„ๆบๆถˆ่€—**
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- **ๅฏน็Žฐๆœ‰ๅบ”็”จ้€ๆ˜ŽๅŠ ้€Ÿ**
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---
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*่™šๆ‹Ÿๅˆ—ๅœจๅŽๅฐ่‡ชๅŠจๅทฅไฝœ - ๅช้œ€ๅฏ็”จ่ฏฅๅŠŸ่ƒฝ๏ผŒ่ฎฉ Databend ไผ˜ๅŒ–ๆ‚จ็š„ JSON ๆŸฅ่ฏขใ€‚*
171+
*่™šๆ‹Ÿๅˆ—ๅœจๅŽๅฐ่‡ชๅŠจๅทฅไฝœโ€”โ€”ๅช้œ€ๅฏ็”จๅŠŸ่ƒฝ๏ผŒDatabend ๅฐ†ไผ˜ๅŒ–ๆ‚จ็š„ JSON ๆŸฅ่ฏขใ€‚*

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