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โ€Ždocs/cn/guides/55-performance/00-cluster-key.md

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title: ้›†็พค้”ฎ
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title: Cluster Key
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# ้›†็พค้”ฎ๏ผš่‡ชๅŠจๆ•ฐๆฎ็ป„็ป‡ๅŠ ้€ŸๆŸฅ่ฏข
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# ่š็ฐ‡้”ฎ (Cluster Key): ่‡ชๅŠจๆ•ฐๆฎ็ป„็ป‡ไปฅๅŠ ้€ŸๆŸฅ่ฏข
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้›†็พค้”ฎ้€š่ฟ‡่‡ชๅŠจๆ•ฐๆฎ็ป„็ป‡ๆœบๅˆถ๏ผŒๆ˜พ่‘—ๆๅ‡ๅคง่กจๆŸฅ่ฏขๆ€ง่ƒฝใ€‚Databend ๅœจๅŽๅฐๆ— ็ผๆŒ็ปญ็ฎก็†ๆ‰€ๆœ‰้›†็พคๆ“ไฝœโ€”โ€”ๆ‚จๅช้œ€ๅฎšไน‰้›†็พค้”ฎ๏ผŒๅ…ถไฝ™ๅทฅไฝœ็”ฑ Databend ่‡ชๅŠจๅฎŒๆˆใ€‚
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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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## ่งฃๅ†ณ็š„ๆ ธๅฟƒ้—ฎ้ข˜
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## ่งฃๅ†ณไบ†ไป€ไนˆ้—ฎ้ข˜๏ผŸ
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ๆœช็ปๅˆ็†็ป„็ป‡็š„ๅคง่กจไผšๅผ•ๅ‘ไธฅ้‡็š„ๆ€ง่ƒฝๅ’Œ็ปดๆŠคๆŒ‘ๆˆ˜๏ผš
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ๆœช็ป้€‚ๅฝ“็ป„็ป‡็š„ๅคงๅž‹่กจไผšๅธฆๆฅๆ˜พ่‘—็š„ๆ€ง่ƒฝๅ’Œ็ปดๆŠคๆŒ‘ๆˆ˜๏ผš
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| ้—ฎ้ข˜ | ๅฝฑๅ“ | ่‡ชๅŠจ้›†็พค่งฃๅ†ณๆ–นๆกˆ |
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| ้—ฎ้ข˜ | ๅฝฑๅ“ | ่‡ชๅŠจ่š็ฐ‡่งฃๅ†ณๆ–นๆกˆ |
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|---------|--------|------------------------------|
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| **ๅ…จ่กจๆ‰ซๆ** | ๅณไฝฟๆŸฅ่ฏข่ฟ‡ๆปคๆ•ฐๆฎไป้œ€่ฏปๅ–ๆ•ด่กจ | ่‡ชๅŠจ็ป„็ป‡ๆ•ฐๆฎ๏ผŒไป…่ฏปๅ–็›ธๅ…ณๆ•ฐๆฎๅ— |
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| **้šๆœบๆ•ฐๆฎ่ฎฟ้—ฎ** | ็›ธไผผๆ•ฐๆฎๅˆ†ๆ•ฃๅญ˜ๅ‚จ | ๆŒ็ปญๅฐ†ๅ…ณ่”ๆ•ฐๆฎๅˆ†็ป„ๅญ˜ๅ‚จ |
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| **่ฟ‡ๆปคๆŸฅ่ฏข็ผ“ๆ…ข** | WHERE ๅญๅฅๆ‰ซๆๆ— ๅ…ณ่กŒ | ่‡ชๅŠจ่ทณ่ฟ‡ไธ็›ธๅ…ณๆ•ฐๆฎๅ— |
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| **้ซ˜I/Oๆˆๆœฌ** | ่ฏปๅ–ๅคง้‡ๆ— ็”จๆ•ฐๆฎ | ่‡ชๅŠจๆœ€ๅฐๅŒ–ๆ•ฐๆฎไผ ่พ“้‡ |
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| **ๆ‰‹ๅŠจ็ปดๆŠค** | ้œ€็›‘ๆŽงๅนถๆ‰‹ๅŠจ้‡็ป„่กจ | ้›ถ็ปดๆŠคโ€”โ€”ๅŽๅฐ่‡ชๅŠจไผ˜ๅŒ– |
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| **่ต„ๆบ็ฎก็†** | ้œ€ไธบ้›†็พคๆ“ไฝœๅˆ†้…่ฎก็ฎ—่ต„ๆบ | Databend ่‡ชๅŠจๅค„็†ๆ‰€ๆœ‰้›†็พค่ต„ๆบ |
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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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**็คบไพ‹**๏ผš็”ตๅ•†ๅนณๅฐ็™พไธ‡็บงๅ•†ๅ“่กจใ€‚ๆœช้›†็พคๆ—ถ๏ผŒๆŸฅ่ฏข `WHERE category IN ('Electronics', 'Computers')` ๅฟ…้กปๆ‰ซๆๆ‰€ๆœ‰ๅ•†ๅ“็ฑปๅˆซใ€‚้€š่ฟ‡ๆŒ‰็ฑปๅˆซ่‡ชๅŠจ้›†็พคๅŽ๏ผŒDatabend ๆŒ็ปญๅฐ†็”ตๅญไบงๅ“ๅ’Œ็”ต่„‘็ฑปๅ•†ๅ“้›†ไธญๅญ˜ๅ‚จ๏ผŒไป…้œ€ๆ‰ซๆ2ไธชๆ•ฐๆฎๅ—่€Œ้ž1000+ไธชใ€‚
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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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## ่‡ชๅŠจ้›†็พค็š„ไผ˜ๅŠฟ
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## ่‡ชๅŠจ่š็ฐ‡็š„ไผ˜ๅŠฟ
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**็ปดๆŠคไพฟๆทๆ€ง**๏ผšDatabend ๆถˆ้™คไบ†ไปฅไธ‹้œ€ๆฑ‚๏ผš
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- ็›‘ๆŽง้›†็พค่กจ็Šถๆ€
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- ๆ‰‹ๅŠจ่งฆๅ‘้‡็ป„ๆ“ไฝœ
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- ๆŒ‡ๅฎš้›†็พค่ฎก็ฎ—่ต„ๆบ
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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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- ๅฎ‰ๆŽ’็ปดๆŠค็ช—ๅฃ
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**ๅทฅไฝœๅŽŸ็†**๏ผšๅฎšไน‰้›†็พค้”ฎๅŽ๏ผŒDatabend ่‡ชๅŠจๆ‰ง่กŒ๏ผš
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- ็›‘ๆŽงDMLๆ“ไฝœๅผ•่ตท็š„่กจๅ˜ๆ›ด
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- ่ฏ„ไผฐไฝ•ๆ—ถ้œ€่ฆ้‡็ป„่กจ
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- ๆ‰ง่กŒๅŽๅฐ้›†็พคไผ˜ๅŒ–
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- ๆŒ็ปญไฟๆŒๆœ€ไผ˜ๆ•ฐๆฎ็ป„็ป‡
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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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ๆ‚จๅช้œ€ไธบๆฏไธช่กจๅฎšไน‰้›†็พค้”ฎ๏ผˆๅฆ‚้€‚็”จ๏ผ‰๏ผŒDatabend ๅฐ†่‡ชๅŠจๅค„็†ๆ‰€ๆœ‰ๅŽ็ปญ็ปดๆŠคใ€‚
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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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## ๆŠ€ๆœฏๅŽŸ็†
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## ๅทฅไฝœๅŽŸ็†
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้›†็พค้”ฎๆ นๆฎๆŒ‡ๅฎšๅˆ—ๅฐ†ๆ•ฐๆฎ็ป„็ป‡ๅˆฐๅญ˜ๅ‚จๅ—๏ผˆParquetๆ–‡ไปถ๏ผ‰ไธญ๏ผš
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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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![้›†็พค้”ฎๅฏ่ง†ๅŒ–](/img/sql/clustered.png)
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![Cluster Key Visualization](/img/sql/clustered.png)
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1. **ๆ•ฐๆฎ็ป„็ป‡** โ†’ ็›ธไผผๅ€ผๅฝ’ๅ…ฅ็›ธ้‚ปๅญ˜ๅ‚จๅ—
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2. **ๅ…ƒๆ•ฐๆฎๅˆ›ๅปบ** โ†’ ๅปบ็ซ‹ๅ—ๅ€ผๆ˜ ๅฐ„ๅฟซ้€Ÿ็ดขๅผ•
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3. **ๆŸฅ่ฏขไผ˜ๅŒ–** โ†’ ไป…่ฏปๅ–็›ธๅ…ณๆ•ฐๆฎๅ—
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4. **ๆ€ง่ƒฝๆๅ‡** โ†’ ๅ‡ๅฐ‘ๆ‰ซๆ่กŒๆ•ฐ๏ผŒๅŠ ้€Ÿ็ป“ๆžœ่ฟ”ๅ›ž
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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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## ๅฟซ้€Ÿ้…็ฝฎ
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## ๅฟซ้€Ÿ่ฎพ็ฝฎ
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```sql
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-- ๅˆ›ๅปบๅธฆ้›†็พค้”ฎ็š„่กจ
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-- Create table with cluster key
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-- ๅˆ›ๅปบๅธฆๆœ‰่š็ฐ‡้”ฎ็š„่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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-- ไธบๅทฒๆœ‰่กจๆทปๅŠ ้›†็พค้”ฎ
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-- Or add cluster key to existing table
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-- ๆˆ–่€…ไธบ็Žฐๆœ‰่กจๆทปๅŠ ่š็ฐ‡้”ฎ
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ALTER TABLE sales CLUSTER BY (region, order_date);
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```
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## ้›†็พค้”ฎ้€‰ๅž‹ๆŒ‡ๅ—
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## ้€‰ๆ‹ฉๆญฃ็กฎ็š„่š็ฐ‡้”ฎ
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ๆ นๆฎ้ซ˜้ข‘ๆŸฅ่ฏขๆกไปถ้€‰ๆ‹ฉๅˆ—๏ผš
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ๆ นๆฎๆ‚จๆœ€ๅธธ่ง็š„ๆŸฅ่ฏข่ฟ‡ๆปคๅ™จ้€‰ๆ‹ฉๅˆ—๏ผš
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| ๆŸฅ่ฏขๆจกๅผ | ๆŽจ่้›†็พค้”ฎ | ็คบไพ‹ |
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| ๆŸฅ่ฏขๆจกๅผ | ๆŽจ่็š„่š็ฐ‡้”ฎ | ็คบไพ‹ |
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|---------------|------------------------|---------|
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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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| 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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| ๆ—ฅๆœŸ่Œƒๅ›ดๆŸฅ่ฏข | ๆ—ฅๆœŸ/ๆ—ถ้—ดๆˆณๅˆ— | `CLUSTER BY (order_date)` |
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| ้ซ˜ๅŸบๆ•ฐๅˆ— | ไฝฟ็”จ่กจ่พพๅผ้™็ปด | `CLUSTER BY (DATE(created_at))` |
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| ้ซ˜ๅŸบๆ•ฐๅˆ— | ไฝฟ็”จ่กจ่พพๅผๅ‡ๅฐ‘ๅ€ผ | `CLUSTER BY (DATE(created_at))` |
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### ้›†็พค้”ฎ้€‰ๅž‹ไผ˜ๅŠฃๅฏนๆฏ”
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### ๅฅฝ็š„่š็ฐ‡้”ฎ vs ๅ็š„่š็ฐ‡้”ฎ
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| โœ… ไผ˜้€‰ๆ–นๆกˆ | โŒ ๅŠฃ้€‰ๆ–นๆกˆ |
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| โœ… ๅฅฝ็š„้€‰ๆ‹ฉ | โŒ ๅทฎ็š„้€‰ๆ‹ฉ |
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|----------------|----------------|
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| ้ซ˜้ข‘่ฟ‡ๆปคๅˆ— | ๆžๅฐ‘ไฝฟ็”จ็š„ๅˆ— |
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| ไธญ็ญ‰ๅŸบๆ•ฐ๏ผˆ100-10Kๅ€ผ๏ผ‰ | ๅธƒๅฐ”ๅˆ—๏ผˆๅ–ๅ€ผ่ฟ‡ๅฐ‘๏ผ‰ |
83-
| ๆ—ฅๆœŸ/ๆ—ถ้—ดๅˆ— | ๅ”ฏไธ€IDๅˆ—๏ผˆๅ–ๅ€ผ่ฟ‡ๅคš๏ผ‰ |
84-
| ๅœฐๅŒบ/็ฑปๅˆซ/็Šถๆ€ๅˆ— | ้šๆœบๆˆ–ๅ“ˆๅธŒๅˆ— |
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— |
8587

86-
## ๆ€ง่ƒฝ็›‘ๆŽง
88+
## ็›‘ๆŽงๆ€ง่ƒฝ
8789

8890
```sql
89-
-- ๆฃ€ๆŸฅ้›†็พคๆ•ˆๆžœ
91+
-- Check clustering effectiveness
92+
-- ๆฃ€ๆŸฅ่š็ฐ‡ๆ•ˆๆžœ
9093
SELECT * FROM clustering_information('database_name', 'table_name');
9194

95+
-- Key metrics to watch:
9296
-- ๅ…ณ้”ฎๆŒ‡ๆ ‡๏ผš
93-
-- average_depth๏ผšๅ€ผ่ถŠไฝŽ่ถŠๅฅฝ๏ผˆ<2ไธบไฝณ๏ผ‰
94-
-- average_overlaps๏ผšๅ€ผ่ถŠไฝŽ่ถŠๅฅฝ
95-
-- block_depth_histogram๏ผšๆทฑๅบฆ1-2็š„ๅ—่ถŠๅคš่ถŠๅฅฝ
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
96103
```
97104

98-
## ้‡็ป„ๆ—ถๆœบ
105+
## ไฝ•ๆ—ถ้‡ๆ–ฐ่š็ฐ‡
99106

100-
ๆ•ฐๆฎๅ˜ๆ›ดไผšๅฏผ่‡ด่กจ้€ๆธๅคฑๅบ๏ผš
107+
้š็€ๆ•ฐๆฎๅ˜ๅŒ–๏ผŒ่กจไผš้š็€ๆ—ถ้—ดๅ˜ๅพ—ๆ— ๅบ๏ผš
101108

102109
```sql
103-
-- ๆฃ€ๆŸฅๆ˜ฏๅฆ้œ€่ฆ้‡็ป„
110+
-- Check if re-clustering is needed
111+
-- ๆฃ€ๆŸฅๆ˜ฏๅฆ้œ€่ฆ้‡ๆ–ฐ่š็ฐ‡
104112
SELECT IF(average_depth > 2 * LEAST(GREATEST(total_block_count * 0.001, 1), 16),
105-
'้œ€่ฆ้‡็ป„',
106-
'้›†็พค็Šถๆ€่‰ฏๅฅฝ')
113+
'Re-cluster needed',
114+
'Clustering is good')
107115
FROM clustering_information('your_database', 'your_table');
108116

109-
-- ้‡็ป„่กจ
117+
-- Re-cluster the table
118+
-- ้‡ๆ–ฐ่š็ฐ‡่กจ
110119
ALTER TABLE your_table RECLUSTER;
111120
```
112121

113122
## ๆ€ง่ƒฝ่ฐƒไผ˜
114123

115-
### ่‡ชๅฎšไน‰ๅ—ๅคงๅฐ
116-
่ฐƒๆ•ดๅ—ๅคงๅฐไผ˜ๅŒ–ๆ€ง่ƒฝ๏ผš
124+
### ่‡ชๅฎšไน‰ๆ•ฐๆฎๅ—ๅคงๅฐ
125+
่ฐƒๆ•ดๆ•ฐๆฎๅ—ๅคงๅฐไปฅ่Žทๅพ—ๆ›ดๅฅฝ็š„ๆ€ง่ƒฝ๏ผš
117126

118127
```sql
119-
-- ่พƒๅฐๅ—=ๆฏๆŸฅ่ฏขๅค„็†ๆ›ดๅฐ‘่กŒ
128+
-- Smaller blocks = fewer rows per query
129+
-- ๆ›ดๅฐ็š„ๆ•ฐๆฎๅ— = ๆฏๆฌกๆŸฅ่ฏข็š„่กŒๆ•ฐๆ›ดๅฐ‘
120130
ALTER TABLE sales SET OPTIONS(
121131
ROW_PER_BLOCK = 100000,
122132
BLOCK_SIZE_THRESHOLD = 52428800
123133
);
124134
```
125135

126-
### ่‡ชๅŠจ้‡็ป„ๆœบๅˆถ
127-
- `COPY INTO` ๅ’Œ `REPLACE INTO` ่‡ชๅŠจ่งฆๅ‘้‡็ป„
128-
- ๅฎšๆœŸ็›‘ๆŽง้›†็พคๆŒ‡ๆ ‡
129-
- ๅฝ“ `average_depth` ่ฟ‡้ซ˜ๆ—ถๆ‰ง่กŒ้‡็ป„
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‡
130140

131141
## ๆœ€ไฝณๅฎž่ทต
132142

133-
| ๅฎž่ทตๆ–นๆกˆ | ๆ”ถ็›Š |
143+
| ๅฎž่ทต | ็›Šๅค„ |
134144
|----------|---------|
135-
| **ไปŽ็ฎ€ๅผ€ๅง‹** | ๅ…ˆไฝฟ็”จๅ•ๅˆ—้›†็พค้”ฎ |
145+
| **ไปŽ็ฎ€ๅ•ๅผ€ๅง‹** | ้ฆ–ๅ…ˆไฝฟ็”จๅ•ๅˆ—่š็ฐ‡้”ฎ |
136146
| **็›‘ๆŽงๆŒ‡ๆ ‡** | ๅฎšๆœŸๆฃ€ๆŸฅ clustering_information |
137-
| **ๆ€ง่ƒฝๆต‹่ฏ•** | ๅฏนๆฏ”้›†็พคๅ‰ๅŽๆŸฅ่ฏข้€Ÿๅบฆ |
138-
| **ๅฎšๆœŸ้‡็ป„** | ๆ•ฐๆฎๅ˜ๆ›ดๅŽ็ปดๆŠค้›†็พค็Šถๆ€ |
139-
| **ๆˆๆœฌ่€ƒ้‡** | ้›†็พคๆ“ไฝœๆถˆ่€—่ฎก็ฎ—่ต„ๆบ |
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 |
140150

141151
## ้‡่ฆ่ฏดๆ˜Ž
142152

143153
:::tip
144-
**้€‚็”จๅœบๆ™ฏ๏ผš**
145-
- ๅคง่กจ๏ผˆ็™พไธ‡+่กŒ๏ผ‰
146-
- ๆŸฅ่ฏขๆ€ง่ƒฝไฝŽไธ‹
147-
- ้ซ˜้ข‘่ฟ‡ๆปคๆŸฅ่ฏข
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
148158
- ๅˆ†ๆžๅž‹ๅทฅไฝœ่ดŸ่ฝฝ
149159

150-
**ไธ้€‚็”จๅœบๆ™ฏ๏ผš**
151-
- ๅฐ่กจ
160+
**ไฝ•ๆ—ถไธไฝฟ็”จ:**
161+
- ๅฐๅž‹่กจ
152162
- ้šๆœบ่ฎฟ้—ฎๆจกๅผ
153-
- ้ข‘็นๅ˜ๆ›ดๆ•ฐๆฎ
163+
- ้ข‘็นๆ›ดๆ”น็š„ๆ•ฐๆฎ
154164
:::
155165

156166
---
157167

158-
*้›†็พค้”ฎๅฏนๅ…ทๆœ‰ๅฏ้ข„ๆต‹่ฟ‡ๆปคๆจกๅผ็š„ๅคงๅž‹้ซ˜้ข‘ๆŸฅ่ฏข่กจๆœ€ๆœ‰ๆ•ˆใ€‚ๅปบ่ฎฎไปŽๆœ€ๅธธ็”จ็š„WHEREๅญๅฅๅˆ—ๅผ€ๅง‹ๅฎžๆ–ฝใ€‚*
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€‚*

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

Lines changed: 30 additions & 31 deletions
Original file line numberDiff line numberDiff line change
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---
2-
title: ่™šๆ‹Ÿๅˆ—
2+
title: Virtual Column
33
---
44

5-
# ่™šๆ‹Ÿๅˆ—๏ผšJSON ๆ•ฐๆฎ็š„่‡ชๅŠจๅŠ ้€Ÿๅผ•ๆ“Ž
5+
# ่™šๆ‹Ÿๅˆ—๏ผšJSON ๆ•ฐๆฎ็š„่‡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€‚
1112

12-
่™šๆ‹Ÿๅˆ—ๆŠ€ๆœฏไธบๅญ˜ๅ‚จๅœจ [VARIANT](/sql/sql-reference/data-types/variant) ๅˆ—ไธญ็š„ๅŠ็ป“ๆž„ๅŒ–ๆ•ฐๆฎๆŸฅ่ฏขๆไพ›่‡ชๅŠจๅŠ ้€Ÿ่ƒฝๅŠ›ใ€‚่ฏฅ็‰นๆ€งไธบ JSON ๆ•ฐๆฎ่ฎฟ้—ฎๅฎž็Žฐไบ† **้›ถ้…็ฝฎๆ€ง่ƒฝไผ˜ๅŒ–**ใ€‚
13+
## ่งฃๅ†ณไบ†ไป€ไนˆ้—ฎ้ข˜๏ผŸ
1314

14-
## ่งฃๅ†ณ็š„ๆ ธๅฟƒ้—ฎ้ข˜
15-
16-
ไผ ็ปŸๆ•ฐๆฎๅบ“ๆŸฅ่ฏข JSON ๆ•ฐๆฎๆ—ถ๏ผŒๆฏๆฌก่ฎฟ้—ฎๅตŒๅฅ—ๅญ—ๆฎต้ƒฝ้œ€่ฆๅฎŒๆ•ด่งฃๆž JSON ็ป“ๆž„๏ผŒๅฏผ่‡ดไปฅไธ‹ๆ€ง่ƒฝ็“ถ้ขˆ๏ผš
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
1716

1817
| ้—ฎ้ข˜ | ๅฝฑๅ“ | ่™šๆ‹Ÿๅˆ—่งฃๅ†ณๆ–นๆกˆ |
1918
|---------|--------|------------------------|
20-
| **ๆŸฅ่ฏขๅปถ่ฟŸ** | ๅคๆ‚ JSON ๆŸฅ่ฏข่€—ๆ—ถๆ•ฐ็ง’ | ไบš็ง’็บงๅ“ๅบ” |
21-
| **ๆ•ฐๆฎ่ฏปๅ–่ฟ‡้‡** | ๅณไฝฟๅช้œ€ๅ•ไธชๅญ—ๆฎตไนŸ่ฆ่ฏปๅ–ๆ•ดไธชๆ–‡ๆกฃ | ไป…่ฏปๅ–็‰นๅฎšๅญ—ๆฎต |
22-
| **JSON ่งฃๆž็ผ“ๆ…ข** | ๆฏๆฌกๆŸฅ่ฏข้ƒฝ้œ€้‡ๆ–ฐ่งฃๆžๅฎŒๆ•ดๆ–‡ๆกฃ | ้ข„็‰ฉๅŒ–ๅญ—ๆฎตๅฎž็Žฐๅณๆ—ถ่ฎฟ้—ฎ |
23-
| **CPU ๅ ็”จ้ซ˜** | JSON ้ๅŽ†ๆถˆ่€—ๅคง้‡่ฎก็ฎ—่ต„ๆบ | ๅƒๅธธ่ง„ๆ•ฐๆฎไธ€ๆ ท็›ดๆŽฅ่ฏปๅ–ๅˆ— |
24-
| **ๅ†…ๅญ˜ๅผ€้”€ๅคง** | ้œ€ๅŠ ่ฝฝๅฎŒๆ•ด JSON ็ป“ๆž„ๅˆฐๅ†…ๅญ˜ | ไป…ๅŠ ่ฝฝๅฟ…่ฆๅญ—ๆฎต |
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 |
2524

26-
**ๅ…ธๅž‹ๅœบๆ™ฏ**๏ผš็”ตๅ•†ๅˆ†ๆž่กจไธญๅญ˜ๅ‚จ JSON ๆ ผๅผ็š„ไบงๅ“ๆ•ฐๆฎใ€‚ๆฒกๆœ‰่™šๆ‹Ÿๅˆ—ๆ—ถ๏ผŒๆŸฅ่ฏข `product_data['category']` ้œ€่ฆ่งฃๆžๆ•ฐ็™พไธ‡่กŒ JSON ๆ–‡ๆกฃ๏ผ›ไฝฟ็”จ่™šๆ‹Ÿๅˆ—ๅŽ๏ผŒ่ฏฅๆ“ไฝœๅ˜ไธบ็›ดๆŽฅ็š„ๅˆ—ๆŸฅๆ‰พใ€‚
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€‚
2726

2827
## ่‡ชๅŠจๅทฅไฝœๅŽŸ็†
2928

30-
1. **ๆ•ฐๆฎๆ‘„ๅ…ฅ** โ†’ Databend ๅˆ†ๆž VARIANT ๅˆ—ไธญ็š„ JSON ็ป“ๆž„
31-
2. **ๆ™บ่ƒฝๆฃ€ๆต‹** โ†’ ็ณป็ปŸ่ฏ†ๅˆซ้ซ˜้ข‘่ฎฟ้—ฎ็š„ๅตŒๅฅ—ๅญ—ๆฎต
29+
1. **ๆ•ฐๆฎๆ‘„ๅ–** โ†’ Databend ๅˆ†ๆž VARIANT ๅˆ—ไธญ็š„ JSON ็ป“ๆž„
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2. **ๆ™บ่ƒฝๆฃ€ๆต‹** โ†’ ็ณป็ปŸ่ฏ†ๅˆซ้ข‘็น่ฎฟ้—ฎ็š„ๅตŒๅฅ—ๅญ—ๆฎต
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3. **ๅŽๅฐไผ˜ๅŒ–** โ†’ ่‡ชๅŠจๅˆ›ๅปบ่™šๆ‹Ÿๅˆ—
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4. **ๆŸฅ่ฏขๅŠ ้€Ÿ** โ†’ ๆŸฅ่ฏข่‡ชๅŠจไฝฟ็”จไผ˜ๅŒ–่ทฏๅพ„
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![่™šๆ‹Ÿๅˆ—ๅทฅไฝœๆต็จ‹](/img/sql/virtual-column.png)
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![Virtual Column Workflow](/img/sql/virtual-column.png)
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## ้…็ฝฎๆ–นๆณ•
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## ้…็ฝฎ
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```sql
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-- ๅฏ็”จๅฎž้ชŒๆ€งๅŠŸ่ƒฝ
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-- ๅฏ็”จ่ฏฅๅŠŸ่ƒฝ๏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˜่ฎคๅฏ็”จ
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SET enable_refresh_virtual_column_after_write = 1; -- ้ป˜่ฎค๏ผšๅฏ็”จ
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```
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## ๅฎŒๆ•ด็คบไพ‹
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ๆœฌ็คบไพ‹ๅฑ•็คบ่™šๆ‹Ÿๅˆ—็š„่‡ชๅŠจๅˆ›ๅปบ่ฟ‡็จ‹ไธŽๆ€ง่ƒฝไผ˜ๅŠฟ๏ผš
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ๆญค็คบไพ‹ๆผ”็คบไบ†่™šๆ‹Ÿๅˆ—็š„่‡ชๅŠจๅˆ›ๅปบๅ’Œๆ€ง่ƒฝไผ˜ๅŠฟ๏ผš
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```sql
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SET enable_experimental_virtual_column=1;
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-- ๅˆ›ๅปบๅŒ…ๅซ Variant ็ฑปๅž‹ๅˆ— 'val' ็š„ๆต‹่ฏ•่กจ
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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€‚
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CREATE TABLE test(id int, val variant);
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-- ๅ‘ๆต‹่ฏ•่กจๆ’ๅ…ฅ Variant ๆ•ฐๆฎๆ ทๆœฌ
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-- ๅ‘ 'test' ่กจๆ’ๅ…ฅๅŒ…ๅซ Variant ๆ•ฐๆฎ็š„็คบไพ‹่ฎฐๅฝ•ใ€‚
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INSERT INTO
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test
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VALUES
@@ -85,7 +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‡ŠๆŸฅ่ฏข็‰นๅฎšๅญ—ๆฎต็š„ๆ‰ง่กŒ่ฎกๅˆ’
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-- ่งฃ้‡ŠไปŽ่กจไธญ้€‰ๆ‹ฉ็‰นๅฎšๅญ—ๆฎต็š„ๆŸฅ่ฏขๆ‰ง่กŒ่ฎกๅˆ’ใ€‚
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EXPLAIN
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SELECT
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val ['name'],
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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‡Šไป…ๆŸฅ่ฏข 'name' ๅญ—ๆฎต็š„ๆ‰ง่กŒ่ฎกๅˆ’
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-- ่งฃ้‡ŠไปŽ่กจไธญไป…้€‰ๆ‹ฉ 'name' ๅญ—ๆฎต็š„ๆŸฅ่ฏขๆ‰ง่กŒ่ฎกๅˆ’ใ€‚
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EXPLAIN
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SELECT
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val ['name']
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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—
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-- ๆ˜พ็คบๆ‰€ๆœ‰่‡ชๅŠจ็”Ÿๆˆ็š„่™šๆ‹Ÿๅˆ—ใ€‚
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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
@@ -159,14 +158,14 @@ SHOW VIRTUAL COLUMNS WHERE table='test';
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| [`REFRESH VIRTUAL COLUMN`](/sql/sql-commands/ddl/virtual-column/refresh-virtual-column) | ๆ‰‹ๅŠจๅˆทๆ–ฐ่™šๆ‹Ÿๅˆ— |
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| [`FUSE_VIRTUAL_COLUMN`](/sql/sql-functions/system-functions/fuse_virtual_column) | ๆŸฅ็œ‹่™šๆ‹Ÿๅˆ—ๅ…ƒๆ•ฐๆฎ |
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## ๆ€ง่ƒฝ่กจ็Žฐ
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## ๆ€ง่ƒฝ็ป“ๆžœ
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่™šๆ‹Ÿๅˆ—ๆŠ€ๆœฏ้€šๅธธๅธฆๆฅ๏ผš
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- **5-10 ๅ€** ็š„ JSON ๅญ—ๆฎต่ฎฟ้—ฎ้€Ÿๅบฆๆๅ‡
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- **ๆ— ้œ€ไฟฎๆ”นๆŸฅ่ฏข** ็š„่‡ชๅŠจไผ˜ๅŒ–
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- **ๆ˜พ่‘—้™ไฝŽ** ๆŸฅ่ฏขๅค„็†ๆ—ถ็š„่ต„ๆบๆถˆ่€—
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- **ๅฏน็Žฐๆœ‰ๅบ”็”จ้€ๆ˜Ž** ็š„ๅŠ ้€Ÿๆ•ˆๆžœ
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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**
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- ๅฏน็Žฐๆœ‰ๅบ”็”จ็จ‹ๅบ็š„**้€ๆ˜ŽๅŠ ้€Ÿ**
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---
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*่™šๆ‹Ÿๅˆ—ๅœจๅŽๅฐ่‡ชๅŠจๅทฅไฝœ - ๅช้œ€ๅฏ็”จ่ฏฅๅŠŸ่ƒฝ๏ผŒDatabend ๅฐฑไผš่‡ชๅŠจไผ˜ๅŒ–ๆ‚จ็š„ JSON ๆŸฅ่ฏขใ€‚*
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*่™šๆ‹Ÿๅˆ—ๅœจๅŽๅฐ่‡ชๅŠจๅทฅไฝœ - ๅช้œ€ๅฏ็”จ่ฏฅๅŠŸ่ƒฝ๏ผŒ่ฎฉ Databend ไผ˜ๅŒ–ๆ‚จ็š„ JSON ๆŸฅ่ฏขใ€‚*

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