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[doc] Add exponential_moving_average aggregate function documentation#3726

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[doc] Add exponential_moving_average aggregate function documentation#3726
HappenLee wants to merge 1 commit into
apache:masterfrom
HappenLee:func

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@HappenLee
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What problem does this PR solve?

Problem Summary:
Doris added the exponential_moving_average aggregate function but no documentation existed.

  • English doc with syntax, parameters, return value, and examples (basic, GROUP BY, NULL handling, empty set, window function, constant requirement).
  • Chinese (zh-CN) translation.
  • Sidebar entry in both aggregate-functions and analytic-functions lists.

Release note

None

Check List (For Author)

  • Test: No need to test (docs only)
  • Behavior changed: No
  • Does this need documentation: No (this IS the documentation)

Versions

  • dev
  • 4.x
  • 3.x
  • 2.1 or older (not covered by version/language sync gate)

Languages

  • Chinese
  • English
  • Japanese candidate translation needed

Docs Checklist

  • Checked by AI
  • Test Cases Built
  • Updated required version and language counterparts, or explained why not
  • If only one language changed, confirmed whether source/translation counterparts need sync

@HappenLee
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run buildall

### What problem does this PR solve?

Problem Summary:
Doris added the exponential_moving_average aggregate function but no
documentation existed.

- English doc with syntax, parameters, return value, and examples
  (basic, GROUP BY, NULL handling, empty set, window function,
   constant requirement).
- Chinese (zh-CN) translation.
- Sidebar entry in both aggregate-functions and analytic-functions
  lists.

### Release note

None

### Check List (For Author)

- Test: No need to test (docs only)
- Behavior changed: No
- Does this need documentation: No (this IS the documentation)
@HappenLee
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run buildall

@HappenLee
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/review

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