Add Iceberg lake-table DDL: CREATE ICEBERG TABLE, FOREIGN CATALOG, FOREIGN VOLUME (kernel scaffolding)#1842

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MisterRaindrop wants to merge 10 commits into

apache:mainfrom

MisterRaindrop:feature/iceberg-ddl-kernel

Commits on Jul 6, 2026

catalog: add pg_foreign_catalog, pg_foreign_volume, pg_lake_table
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nodes: add parse nodes for Iceberg lake-table DDL
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parser: add grammar for CREATE ICEBERG TABLE / FOREIGN CATALOG / VOLUME
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commands: implement CREATE/DROP FOREIGN CATALOG and FOREIGN VOLUME
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commands: implement CREATE ICEBERG TABLE
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bin: pg_dump skip and psql tab completion for lake-table DDL
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tests: add lake_table regression test, refresh catalog expecteds
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Use ASF license header for new lake-table source files
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Move ASF license header to top of file header block
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Commits on Jul 7, 2026

foreigncmds: flatten IF NOT EXISTS duplicate handling
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