feat(dashboard): display metadata for index itself besides index table

[BugenZhao]

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What's changed and what's your intention?

Previously we only displayed the metadata for the state table of the index, which lacked information about the index itself, espeically the index_items, i.e., expression of each index column.

Checklist

• I have written necessary rustdoc comments.
• I have added necessary unit tests and integration tests.
• I have added test labels as necessary.
• I have added fuzzing tests or opened an issue to track them.
• My PR contains breaking changes.
• My PR changes performance-critical code, so I will run (micro) benchmarks and present the results.
• I have checked the Release Timeline and Currently Supported Versions to determine which release branches I need to cherry-pick this PR into.

Documentation

• My PR needs documentation updates.

Release note

[BugenZhao]

• refactor: remove col_index_mapping when replacing table #21685
• feat(meta): rewrite index after ALTER COLUMN TYPE #21681
• test: add tests for ALTER COLUMN TYPE with downstream jobs #21686
• feat(meta): consider types when resolve dispatcher output mapping  #21662
• feat(streaming): support mapping column type in dispatcher #21661
• feat(meta): enrich dispatcher output indices to support storing type mapping information #21645
• refactor(meta): avoid using frontend generated ColumnIndexMapping when constructing new dispatcher for replacement #21499
• feat(dashboard): display metadata for index itself besides index table #21680 👈 (View in Graphite)
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[Copilot]

Pull Request Overview

This PR enhances the dashboard to display metadata for the index itself (including index items) in addition to the index table information. Key changes include:

• Refactoring the endpoints to separate index table and index item metadata.
• Adding a new API function to join index table data with the corresponding index items.
• Updating the UI to display an additional column for index item counts.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/meta/src/dashboard/mod.rs	Introduces separate endpoints for index tables and index metadata.
src/meta/src/controller/catalog/list_op.rs	Adds a new controller method to list index items from the catalog.
dashboard/pages/indexes.tsx	Adds a new column to display index item counts in the dashboard UI.
dashboard/lib/api/streaming.ts	Implements the merging logic for index table and index item metadata.

Comments suppressed due to low confidence (2)

src/meta/src/dashboard/mod.rs:153

• [nitpick] Consider renaming the 'list_indexes' function to 'list_index_items' or similar to clearly differentiate it from the 'list_index_tables' endpoint.

pub async fn list_indexes(Extension(srv): Extension<Service>) -> Result<Json<Vec<Index>>> {

dashboard/pages/indexes.tsx:28

• [nitpick] The column header 'Index Len' may be ambiguous; consider using a more descriptive label like 'Index Column Count' to better communicate its purpose.

const indexItemsCountColumn: Column<Index> = {

[Copilot]

When merging index table and index item data, a missing matching index item leads to the entry being silently dropped. Consider explicitly handling this case (e.g., logging a warning) to avoid potential data discrepancies.

Suggested change

	if (index === undefined) {
	if (index === undefined) {
	console.warn(`No matching index item found for index table with id: ${x.id}`)