Hive LIKE Operator: Wildcards & Performance

When using the LIKE operator in Hive, there are several points to consider:

1. When using LIKE, be cautious of using wildcards, where % represents zero or more characters, and _ represents a single character. Make sure you understand the meanings of these wildcards to get the desired results.
2. Considering performance issues, using the LIKE operator on large datasets may lead to performance problems. It is recommended to avoid using wildcard searches on large datasets, or consider other more efficient methods.
3. It is important to be aware of case sensitivity when using LIKE in Hive. By default, Hive is case insensitive, but if you want to perform a case sensitive query, you can use the BINARY keyword.
4. When performing a fuzzy search on text containing special characters, it is necessary to escape the special characters to ensure the accuracy of the search results.

In general, when using the LIKE operator in Hive, attention should be paid to issues such as wildcard usage, performance, case sensitivity, and handling special characters to ensure the accuracy of query results and effectiveness of performance.