ZenoYang

[improvement](vectorized) Improve count distinct performance by using fastunion

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# Proposed changes Issue Number: close #xxx Improve count distinct performance by using fastunion. Testing our user real data has a 10-40% performance improvement. ## Problem summary Describe your changes....

[feature-wip](vectorized) Support block aggregate in scanner

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# Proposed changes Issue Number: close #10083 In scanner thread, the same key of adjacent rows is aggregated, which reduces data transmission and improves the parallelism of aggregation. Note: The...

cherry-pick: #44489 ## Why I'm doing: ## What I'm doing: Fixes #issue ## What type of PR is this: - [x] BugFix - [ ] Feature - [ ] Enhancement...

我是小白，请问下面这个问题怎么解决？

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[Bug] Parsing of double result fails when using JDBC

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### Steps to reproduce the behavior (Required) In the lake warehouse query scenario, StarRocks is used to read data in hive/iceberg/.... When the double type of the external table stores...