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https://github.com/hasura/graphql-engine.git
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d12827561b
PR-URL: https://github.com/hasura/graphql-engine-mono/pull/6444 GitOrigin-RevId: 2baf2c954aeead47b82396cafe703e41e0f201a2
205 lines
8.0 KiB
SQL
205 lines
8.0 KiB
SQL
WITH
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"tabletable" as ( SELECT "table".oid,
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"table".relkind,
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"table".relname AS "table_name",
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"schema".nspname AS "table_schema"
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FROM pg_catalog.pg_class "table"
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JOIN pg_catalog.pg_namespace "schema"
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ON schema.oid = "table".relnamespace
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WHERE "table".relkind IN ('r', 't', 'v', 'm', 'f', 'p')
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-- and tables not from any system schemas
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AND "schema".nspname NOT LIKE 'pg_%'
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AND "schema".nspname NOT IN ('information_schema', 'hdb_catalog', 'hdb_lib', '_timescaledb_internal', 'crdb_internal')
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)
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SELECT
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"table".table_schema,
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"table".table_name,
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-- This field corresponds to the `DBTableMetadata` Haskell type
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jsonb_build_object(
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'oid', "table".oid :: integer,
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'columns', coalesce(columns.info, '[]'),
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'primary_key', primary_key.info,
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-- Note: unique_constraints does NOT include primary key constraints!
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'unique_constraints', coalesce(unique_constraints.info, '[]'),
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'foreign_keys', coalesce(foreign_key_constraints.info, '[]'),
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-- Note: for views and materialized views, we are asking Postgres if it is mutable or not
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-- and for any other case, we are assuming it to be mutable.
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'view_info', CASE WHEN "table".relkind IN ('v', 'm') THEN jsonb_build_object(
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'is_updatable', ((pg_catalog.pg_relation_is_updatable("table".oid, true) & 4) = 4),
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'is_insertable', ((pg_catalog.pg_relation_is_updatable("table".oid, true) & 8) = 8),
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'is_deletable', ((pg_catalog.pg_relation_is_updatable("table".oid, true) & 16) = 16)
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) END,
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'description', description.description,
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'extra_table_metadata', '[]'::json
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)::json AS info
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FROM "tabletable" "table"
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-- tracked tables
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-- $1 parameter provides JSON array of tracked tables
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-- FROM
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-- ( SELECT "tracked"."name" AS "table_name",
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-- "tracked"."schema" AS "table_schema"
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-- FROM jsonb_to_recordset($1::jsonb) AS "tracked"("schema" text, "name" text)
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-- ) "tracked_table"
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-- table & schema
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-- LEFT JOIN
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-- ( SELECT "table".oid,
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-- "table".relkind,
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-- "table".relname AS "table_name",
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-- "schema".nspname AS "table_schema"
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-- FROM pg_catalog.pg_class "table"
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-- JOIN pg_catalog.pg_namespace "schema"
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-- ON schema.oid = "table".relnamespace
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-- ) "table"
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--ON "table"."table_name" = "tracked_table"."table_name"
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--AND "table"."table_schema" = "tracked_table"."table_schema"
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-- description
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LEFT JOIN pg_catalog.pg_description description
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ON description.classoid = 'pg_catalog.pg_class'::regclass
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AND description.objoid = "table".oid
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AND description.objsubid = 0
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-- columns
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LEFT JOIN LATERAL
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( SELECT jsonb_agg(jsonb_build_object(
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'name', "column".attname,
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'position', "column".attnum,
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'type', json_build_object('name', coalesce(base_type.typname, "type".typname), 'type', "type".typtype),
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'is_nullable', NOT "column".attnotnull,
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'description', '', -- pg_catalog.col_description("table".oid, "column".attnum), -- removing this for now as it takes ~20 seconds per lookup
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'mutability', jsonb_build_object(
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'is_insertable', NOT ("column".attidentity = 'a' OR "column".attgenerated = 's'),
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'is_updatable', NOT ("column".attidentity = 'a' OR "column".attgenerated = 's'))
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)) AS info
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FROM pg_catalog.pg_attribute "column"
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LEFT JOIN pg_catalog.pg_type "type"
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ON "type".oid = "column".atttypid
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LEFT JOIN pg_catalog.pg_type base_type
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ON "type".typtype = 'd' AND base_type.oid = "type".typbasetype
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WHERE "column".attrelid = "table".oid
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-- columns where attnum <= 0 are special, system-defined columns
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AND "column".attnum > 0
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-- dropped columns still exist in the system catalog as "zombie" columns, so ignore those
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AND NOT "column".attisdropped
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) columns ON true
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-- primary key
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LEFT JOIN LATERAL
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( SELECT jsonb_build_object(
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'constraint', jsonb_build_object(
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'name', class.relname,
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'oid', class.oid :: integer),
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'columns', coalesce(columns.info, '[]')
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) AS info
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FROM pg_catalog.pg_index idx
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JOIN pg_catalog.pg_class class
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ON class.oid = idx.indexrelid
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LEFT JOIN LATERAL
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( SELECT jsonb_agg("column".attname) AS info
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FROM pg_catalog.pg_attribute "column"
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WHERE "column".attrelid = "table".oid
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AND "column".attnum = ANY (idx.indkey)
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) AS columns ON true
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WHERE idx.indrelid = "table".oid
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AND idx.indisprimary
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) primary_key ON true
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-- unique constraints
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LEFT JOIN LATERAL
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( SELECT jsonb_agg(
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jsonb_build_object(
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'constraint', jsonb_build_object(
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'name', class.relname,
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'oid', class.oid :: integer
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),
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'columns', coalesce(columns.info, '[]')
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)
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) AS info
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FROM pg_catalog.pg_index idx
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JOIN pg_catalog.pg_class class
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ON class.oid = idx.indexrelid
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LEFT JOIN LATERAL
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( SELECT jsonb_agg("column".attname) AS info
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FROM pg_catalog.pg_attribute "column"
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WHERE "column".attrelid = "table".oid
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AND "column".attnum = ANY (idx.indkey)
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) AS columns ON true
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WHERE idx.indrelid = "table".oid
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AND idx.indisunique
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AND NOT idx.indisprimary
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) unique_constraints ON true
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-- foreign keys
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LEFT JOIN
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( SELECT jsonb_agg(jsonb_build_object(
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'constraint', jsonb_build_object(
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'name', foreign_key.constraint_name,
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'oid', foreign_key.constraint_oid :: integer
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),
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'columns', foreign_key.columns,
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'foreign_table', jsonb_build_object(
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'schema', foreign_key.ref_table_table_schema,
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'name', foreign_key.ref_table
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),
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'foreign_columns', foreign_key.ref_columns
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)) AS info, -- This field corresponds to the `PGForeignKeyMetadata` Haskell type
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foreign_key.table_schema,
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foreign_key.table_name
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FROM (SELECT
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q.table_schema :: text,
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q.table_name :: text,
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q.constraint_name :: text,
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min(q.constraint_oid) :: integer as constraint_oid,
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min(q.ref_table_table_schema) :: text as ref_table_table_schema,
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min(q.ref_table) :: text as ref_table,
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json_agg(ac.attname) as columns,
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json_agg(afc.attname) as ref_columns
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FROM
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(SELECT
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ctn.nspname AS table_schema,
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ct.relname AS table_name,
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r.conrelid AS table_id,
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r.conname as constraint_name,
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r.oid as constraint_oid,
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cftn.nspname AS ref_table_table_schema,
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cft.relname as ref_table,
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r.confrelid as ref_table_id,
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UNNEST (r.conkey) AS column_id,
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UNNEST (r.confkey) AS ref_column_id
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FROM
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pg_catalog.pg_constraint r
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JOIN pg_catalog.pg_class ct
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ON r.conrelid = ct.oid
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JOIN pg_catalog.pg_namespace ctn
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ON ct.relnamespace = ctn.oid
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JOIN pg_catalog.pg_class cft
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ON r.confrelid = cft.oid
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JOIN pg_catalog.pg_namespace cftn
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ON cft.relnamespace = cftn.oid
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WHERE
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r.contype = 'f'
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) q
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JOIN pg_catalog.pg_attribute ac
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ON q.column_id = ac.attnum
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AND q.table_id = ac.attrelid
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JOIN pg_catalog.pg_attribute afc
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ON q.ref_column_id = afc.attnum
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AND q.ref_table_id = afc.attrelid
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GROUP BY q.table_schema, q.table_name, q.constraint_name
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) foreign_key
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GROUP BY foreign_key.table_schema, foreign_key.table_name
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) foreign_key_constraints
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ON "table".table_name = foreign_key_constraints.table_name
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AND "table".table_schema = foreign_key_constraints.table_schema;
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-- -- all these identify table-like things
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-- WHERE "table".relkind IN ('r', 't', 'v', 'm', 'f', 'p')
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-- -- and tables not from any system schemas
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-- AND "table".table_schema NOT LIKE 'pg_%'
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-- AND "table".table_schema NOT IN ('information_schema', 'hdb_catalog', 'hdb_lib', '_timescaledb_internal', 'crdb_internal');
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