[introspect] Add schema introspection module - #7
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Foundation for snapshot, diff, deps, and lint features. Structured DDL parsing (field-by-field, not string diff) for MergeTree, ReplacingMergeTree, SharedMergeTree, views, MVs, and dictionaries. Includes dependency graph with typed edges (schema vs data_flow) and topological ordering. Solves: DRY-18 Phase 2 introspection module Tests: 28 unit tests with sample DDL (no live DB needed)
This was referenced Mar 6, 2026
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