statement: renderer-owned dialect degradation and demo test suite#32
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Consolidates the dialect-aware SQL rendering work: - Renderer decides null-collation ordering for UNION ORDER BY ordinals (requiresUnionOrderByOrdinal) instead of the model. - Renderer completes GROUP BY for restrictive dialects, with a per-projection GROUP-BY-completion exemption marker. - Renderer degrades count(distinct) to a dummyname subquery (P2b) and renders InTuple degradation parent-first without its own outer parenthesis. - Deletes the statement.compare seam (StatementEquivalence, SqlTextNormalizer) now that the renderer owns SQL-shape decisions. - Follows jdbc dependency moves: SQL-shape enums to jdbc.db.api.sql and the type model to jdbc.db.api.type. - Adds the statement.demo module with a broad demo/test suite covering aggregates, CTEs, joins, comments, parameters and more, plus renderer hardening tests. Signed-off-by: Stefan Bischof <stbischof@bipolis.org>
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Consolidates the dialect-aware SQL rendering work: