Method for reading query results during upgrade modification

[qingxinhome]

User description

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #https://github.com/matrixorigin/MO-Cloud/issues/4067

What this PR does / why we need it:

Method for reading query results during upgrade modification
Change from UnsafeStringAt() to call GetStringAt()

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PR Type

Bug fix

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Description

• Replaced UnsafeGetStringAt with GetStringAt across multiple files for safer string retrieval.
• Improved safety in handling query results during upgrade modifications.
• Addressed issue Update readme #4067 by ensuring safer string operations in various functions.

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Changes walkthrough 📝

Relevant files

Bug fix

upgrade_strategy.go Replace Unsafe String Retrieval with Safe Method                  pkg/bootstrap/versions/upgrade_strategy.go Replaced UnsafeGetStringAt with GetStringAt for safer string retrieval. Updated multiple instances within CheckTableColumn, CheckViewDefinition, and CheckTableComment functions. +6/-6      upgrade_tenant_task.go Improve String Handling Safety in Tenant Tasks                      pkg/bootstrap/versions/upgrade_tenant_task.go Changed UnsafeGetStringAt to GetStringAt for safer string handling. Applied changes in GetUpgradeTenantTasks, GetTenantCreateVersionForUpdate, and GetTenantVersion. +3/-3      version.go Enhance Version Retrieval Safety                                                  pkg/bootstrap/versions/version.go Updated UnsafeGetStringAt to GetStringAt for safer operations. Modified in GetLatestVersion, GetLatestUpgradeVersion, and MustGetLatestReadyVersion. +3/-3

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PR Reviewer Guide 🔍

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Key issues to review Potential Error Handling The change from UnsafeGetStringAt to GetStringAt may require additional error handling, as GetStringAt can return an error.

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PR Code Suggestions ✨

Category	Suggestion	Score
Performance	Optimize slice appending for better performance Consider using append with multiple arguments instead of appending in a loop to improve performance when adding elements to the tenants and versions slices. pkg/bootstrap/versions/upgrade_tenant_task.go [111-117] res.ReadRows(func(rows int, cols []*vector.Vector) bool { + newTenants := make([]int32, rows) + newVersions := make([]string, rows) for i := 0; i < rows; i++ { - tenants = append(tenants, vector.GetFixedAt[int32](cols[0], i)) - versions = append(versions, cols[1].GetStringAt(i)) + newTenants[i] = vector.GetFixedAt[int32](cols[0], i) + newVersions[i] = cols[1].GetStringAt(i) } + tenants = append(tenants, newTenants...) + versions = append(versions, newVersions...) return true }) Apply this suggestion Suggestion importance[1-10]: 9 Why: This suggestion optimizes the code by reducing the number of append operations, which can significantly improve performance, especially with large datasets.	9
Enhancement	Use a switch statement for cleaner and more efficient type-based logic Consider using a switch statement instead of multiple if-else conditions when checking the data type and setting the column length, precision, and scale. pkg/bootstrap/versions/upgrade_strategy.go [253-256] colInfo.ColType = data_type colInfo.Nullable = checkInput(is_nullable) -if data_type == "varchar" || data_type == "char" { +switch data_type { +case "varchar", "char": colInfo.Length = int(character_length) -} else if data_type == "decimal" { +case "decimal": colInfo.Precision = int(numeric_precision) colInfo.Scale = int(numeric_scale) -} else if data_type == "datetime" || data_type == "timestamp" { +case "datetime", "timestamp": colInfo.Precision = int(datetime_precision) } Apply this suggestion Suggestion importance[1-10]: 8 Why: Switching to a switch statement can make the code cleaner and more efficient, improving readability and maintainability, which is beneficial for future modifications.	8
Maintainability	Provide more informative panic messages for easier debugging Consider using a more descriptive error message when panicking due to a missing latest ready version. Include information about the query or context that led to this situation. pkg/bootstrap/versions/version.go [130-131] if version == "" { - panic("missing latest ready version") + panic("Failed to retrieve the latest ready version from the database. This may indicate a data integrity issue or a problem with the version management system.") } Apply this suggestion Suggestion importance[1-10]: 8 Why: Providing a more informative panic message can greatly aid in debugging and understanding the context of the error, enhancing maintainability and troubleshooting.	8
Best practice	Use named return values for better code clarity and safety Consider using a named return value for colInfo to improve code readability and reduce the risk of forgetting to return the updated value. pkg/bootstrap/versions/upgrade_strategy.go [237] func CheckTableColumn(txn executor.TxnExecutor, - accountId uint32, schema string, table string, column string) (ColInfo, error) { + accountId uint32, schema string, table string, column string) (colInfo ColInfo, err error) { ... - colInfo := ColInfo{} - ... - return colInfo, err + return Suggestion importance[1-10]: 7 Why: Using named return values can improve code readability and reduce the risk of errors by ensuring that the correct values are returned, but it is not a critical change.	7