docs: function alias

[soyeric128]

This change is related to databendlabs/databend#17920:

• Support CREATE OR REPLACE syntax for tasks
• IFF is now an alias for the IF function
• GREATEST and LEAST will now return NULL if any input argument is NULL
• Added GREATEST_IGNORE_NULLS and LEAST_IGNORE_NULLS, which ignore NULL values (same behavior as the previous GREATEST and LEAST)
• Added VAR_POP and VARIANCE_POP as aliases for the COVAR_POP function
• Added VAR_SAMP and VARIANCE_SAMP as aliases for the COVAR_SAMP function
• Support INSERT OVERWRITE INTO syntax (equivalent to INSERT OVERWRITE)

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Name	Status	Preview	Comments	Updated (UTC)
databend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 15, 2025 2:00am