ExcelTable is a pipelined table interface to read Excel files (.xlsx, .xlsm, .xlsb, .xls, .xml), ODF spreadsheet files (.ods), and flat files (delimited or positional) as if they were external tables.

Ensure all Excel files are closed before running (to avoid ~$ lockfiles). The script expects real data headers to start at row 2 (row 1 is metadata in Capitaline exports).

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本文将深入剖析每种 Join 的底层原理、适用场景，并通过完整代码示例演示实战用法，帮助读者掌握 Flink SQL Join 的选型与优化。 二、Regular Join：常规双流 Join 1. 定义与核心思想 Regular Join 是 Flink SQL 中最基础的 Join 类型，语法与标准 SQL 一致（如 INNER JOIN、LEFT JOIN）。