fix(spi): Typo in the comment of MaterializedViewDefinition.TableColumn

[hantangwangd]

Description

This PR fix a typo in the comment of MaterializedViewDefinition.TableColumn. The correct SQL grammar should be:

SELECT t1.a as t1_a, t2.a as t2_a FROM t1 LEFT JOIN t2 ON t1.a = t2.a

Previously it was incorrectly written as:

SELECT t1_a as t1.a, t2_a as t2.a FROM t1 LEFT JOIN t2 ON t1.a = t2.a

Motivation and Context

N/A

Impact

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Test Plan

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Contributor checklist

• Please make sure your submission complies with our contributing guide, in particular code style and commit standards.
• PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
• Documented new properties (with its default value), SQL syntax, functions, or other functionality.
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Release Notes

== NO RELEASE NOTE ==

Summary by Sourcery

Documentation:

• Fix incorrect SQL example in MaterializedViewDefinition.TableColumn Javadoc comment to reflect proper alias usage.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Corrects example SQL in a comment on MaterializedViewDefinition.TableColumn to use valid column aliasing, aligning the documentation with the actual join semantics; no functional or behavioral code changes.

File-Level Changes

Change	Details	Files
Fix SQL example in TableColumn comment to use correct aliasing for LEFT JOIN column mapping description.	Update the SELECT example to alias table columns to output column names instead of the reverse. Keep the surrounding explanation of direct vs non-direct mappings unchanged, only adjusting the example to match the described semantics.	presto-spi/src/main/java/com/facebook/presto/spi/MaterializedViewDefinition.java

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