fix: correct promql behavior on nonexistent columns

[waynexia]

This reverts commit 33a2485.I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#5519 doesn't make it correct

What's changed and what's your intention?

Nonexistent columns can be treated as a column with all value set to ""

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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Copilot reviewed 1 out of 5 changed files in this pull request and generated no comments.

Files not reviewed (4)

• tests/cases/standalone/common/promql/label.result: Language not supported
• tests/cases/standalone/common/promql/label.sql: Language not supported
• tests/cases/standalone/common/promql/non_existent_matchers.result: Language not supported
• tests/cases/standalone/common/promql/non_existent_matchers.sql: Language not supported

Comments suppressed due to low confidence (2)

src/query/src/promql/planner.rs:763

• [nitpick] The variable name 'table_scan' is used multiple times. Consider using a more descriptive name like 'initial_table_scan' or 'base_table_scan'.

let mut table_scan = self.create_table_scan_plan(table_ref.clone()).await?;

src/query/src/promql/planner.rs:761

• [nitpick] The comment 'make table scan plan' should be 'Create table scan plan' for better clarity and grammar.

// make table scan plan

[waynexia]

(also reimplement the logic without closure inside closure

[WenyXu]

LGTM