[fupelaqu]

Summary

Documentation only. The six documentation changes merged for engine 0.25.0 (#455, #456, #457, #458, #459, #460) left a few older statements on other pages false, and one new link pointing to the wrong section. This PR fixes them, and adds to the DQL function summary the short notes that the web site's twin of that page now carries, so both stay the same.

What changes

• GREATEST / LEAST (functions_conditional.md, dql_statements.md): "any other argument is refused" was false since feat(sql): quoted arguments and implicit comparisons read as DuckDB does (SCHEMA-5b) #460. A quoted argument counts as the type of the arguments beside it (GREATEST(n, '1.5') is an INT, GREATEST(d, '2024-01-15') a DATE), and a BOOLEAN beside whole numbers counts as 1 / 0. The result-type sentences count a quoted argument as the number it is read as.

• NULLIF (functions_conditional.md): a boolean against a number is compared as 1 / 0 since feat(sql): quoted arguments and implicit comparisons read as DuckDB does (SCHEMA-5b) #460, no longer refused. A boolean against a date still is.

• Comparing values of different types (operators.md): it is now a heading. The four links to it (type_conversion.md, functions_conditional.md twice, dql_statements.md) used #operator-, which opens the + operator section.

• Index patterns and _field_caps (operators.md, known_limitations.md): since feat(core): mapping types, field caps fallback and index patterns typed (SCHEMA-7) #459 a keyword beside a long or a date is a VARCHAR, and a user who may not read the mapping is typed from _field_caps. "A mapping that cannot be read" no longer names a case with no type.

• Window partitions (known_limitations.md): since feat(core): computed-only projections without _source, DuckDB numeric widths (SCHEMA-5) #455 a partition column the SELECT does not return is read when the SELECT holds no plain column at all, not only under *, as gateway.md already says.

• Several values (gateway.md, dql_statements.md): since feat(sql): ARRAY<X> round trip, derived and WITH columns typed, struct order (SCHEMA-6) #456 a one-element array is its element only in a column not declared a list, and a set operation answers a multi-valued date as a list only for a column declared ARRAY<DATE> / ARRAY<TIMESTAMP>. An ARRAY<X> column is no longer read without a type.

• gateway.md: schema is None only when neither the mapping nor _field_caps can type the source. The mapping-types table says what Declared and Reported mean.

• date_nanos (functions_conditional.md): no longer described as a column of unknown type (feat(core): mapping types, field caps fallback and index patterns typed (SCHEMA-7) #459).

• Examples (dql_statements.md): the SHOW TABLE, SHOW CREATE TABLE and DESCRIBE TABLE outputs list profile's sub-fields in their declared order (feat(sql): ARRAY<X> round trip, derived and WITH columns typed, struct order (SCHEMA-6) #456).

• DQL function summary (dql_statements.md):

  • the result types of ROUND, POW, SQRT, EXP, LOG, LOG10, DATEDIFF and DATE_TRUNC;
  • a date part compared with a quoted number;
  • NULLIF over a text and a number in a query;
  • quoted arguments and booleans in COALESCE / GREATEST / LEAST.

  Each note is a summary of the function pages, with a link to them.

Verification

• An independent review checked every changed sentence against the documentation and the code on main; its findings are fixed here.
• The SQL statements and shapes added to the docs parse with the engine's parser.
• The web site's twin of these pages builds (47 pages, no warning): SOFTNETWORK-APP/softclient4es-web#78.

Recorded, not fixed

• known_limitations.md still ends with "as of engine 0.24.0". That line is updated by the release documentation sweep.

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