mcp: surface data product hydration readiness via mz_mcp_data_product_details#36617
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…the SQL-level case sees the MV
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May 20, 2026
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The new hydration aggregation in src/catalog/src/builtin/mz_internal.rs merges rows by (object_name, cluster) even though hydration_meta can emit multiple rows for the same data product/cluster when the object has multiple indexes on that cluster
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Fixes https://linear.app/materializeinc/issue/DEX-30/expose-data-product-hydration-readiness-state-via-mcp.