fix relation detection bug and allow offset on lower levels
This commit is contained in:
Ruslan Talpa
@@ -558,73 +558,73 @@ allSynonyms cols =
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where
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-- query explanation at https://gist.github.com/ruslantalpa/2eab8c930a65e8043d8f
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sql = [q|
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WITH view_columns AS (
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SELECT
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c.oid AS view_oid,
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a.attname::information_schema.sql_identifier AS column_name
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FROM pg_attribute a
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JOIN pg_class c ON a.attrelid = c.oid
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JOIN pg_namespace nc ON c.relnamespace = nc.oid
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WHERE
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NOT pg_is_other_temp_schema(nc.oid)
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AND a.attnum > 0
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AND NOT a.attisdropped
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AND (c.relkind = 'v'::"char")
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AND nc.nspname NOT IN ('information_schema', 'pg_catalog')
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with view_columns as (
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select
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c.oid as view_oid,
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a.attname::information_schema.sql_identifier as column_name
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from pg_attribute a
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join pg_class c on a.attrelid = c.oid
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join pg_namespace nc on c.relnamespace = nc.oid
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where
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not pg_is_other_temp_schema(nc.oid)
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and a.attnum > 0
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and not a.attisdropped
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and (c.relkind = 'v'::"char")
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and nc.nspname not in ('information_schema', 'pg_catalog')
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),
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view_column_usage AS (
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SELECT DISTINCT
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v.oid as view_oid,
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nv.nspname::information_schema.sql_identifier AS view_schema,
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v.relname::information_schema.sql_identifier AS view_name,
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nt.nspname::information_schema.sql_identifier AS table_schema,
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t.relname::information_schema.sql_identifier AS table_name,
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a.attname::information_schema.sql_identifier AS column_name,
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pg_get_viewdef(v.oid)::information_schema.character_data AS view_definition
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FROM pg_namespace nv
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JOIN pg_class v ON nv.oid = v.relnamespace
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JOIN pg_depend dv ON v.oid = dv.refobjid
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JOIN pg_depend dt ON dv.objid = dt.objid
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JOIN pg_class t ON dt.refobjid = t.oid
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JOIN pg_namespace nt ON t.relnamespace = nt.oid
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JOIN pg_attribute a ON t.oid = a.attrelid AND dt.refobjsubid = a.attnum
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view_column_usage as (
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select distinct
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v.oid as view_oid,
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nv.nspname::information_schema.sql_identifier as view_schema,
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v.relname::information_schema.sql_identifier as view_name,
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nt.nspname::information_schema.sql_identifier as table_schema,
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t.relname::information_schema.sql_identifier as table_name,
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a.attname::information_schema.sql_identifier as column_name,
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pg_get_viewdef(v.oid)::information_schema.character_data as view_definition
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from pg_namespace nv
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join pg_class v on nv.oid = v.relnamespace
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join pg_depend dv on v.oid = dv.refobjid
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join pg_depend dt on dv.objid = dt.objid
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join pg_class t on dt.refobjid = t.oid
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join pg_namespace nt on t.relnamespace = nt.oid
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join pg_attribute a on t.oid = a.attrelid and dt.refobjsubid = a.attnum
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WHERE
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nv.nspname not in ('information_schema', 'pg_catalog')
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AND v.relkind = 'v'::"char"
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AND dv.refclassid = 'pg_class'::regclass::oid
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AND dv.classid = 'pg_rewrite'::regclass::oid
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AND dv.deptype = 'i'::"char"
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AND dv.refobjid <> dt.refobjid
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AND dt.classid = 'pg_rewrite'::regclass::oid
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AND dt.refclassid = 'pg_class'::regclass::oid
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AND (t.relkind = ANY (ARRAY['r'::"char", 'v'::"char", 'f'::"char"]))
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where
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nv.nspname not in ('information_schema', 'pg_catalog')
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and v.relkind = 'v'::"char"
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and dv.refclassid = 'pg_class'::regclass::oid
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and dv.classid = 'pg_rewrite'::regclass::oid
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and dv.deptype = 'i'::"char"
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and dv.refobjid <> dt.refobjid
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and dt.classid = 'pg_rewrite'::regclass::oid
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and dt.refclassid = 'pg_class'::regclass::oid
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and (t.relkind = any (array['r'::"char", 'v'::"char", 'f'::"char"]))
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),
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candidates AS (
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SELECT
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vcu.*,
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(
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SELECT CASE WHEN match IS NOT NULL THEN coalesce(match[7], match[4]) END
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FROM REGEXP_MATCHES(
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CONCAT('SELECT ', SPLIT_PART(vcu.view_definition, 'SELECT', 2)),
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CONCAT('SELECT.*?((',vcu.table_name,')|(\w+))\.(', vcu.column_name, ')(\sAS\s(")?([^"]+)\6)?.*?FROM.*?',vcu.table_schema,'\.(\2|',vcu.table_name,'\s+(AS\s)?\3)'),
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'ns'
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) match
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) AS view_column_name
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FROM view_column_usage AS vcu
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candidates as (
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select
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vcu.*,
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(
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select case when match is not null then coalesce(match[8], match[7], match[4]) end
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from regexp_matches(
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CONCAT('SELECT ', SPLIT_PART(vcu.view_definition, 'SELECT', 2)),
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CONCAT('SELECT.*?((',vcu.table_name,')|(\w+))\.(', vcu.column_name, ')(\s+AS\s+("([^"]+)"|([^, \n\t]+)))?.*?FROM.*?',vcu.table_schema,'\.(\2|',vcu.table_name,'\s+(as\s)?\3)'),
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'nsi'
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) match
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) as view_column_name
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from view_column_usage as vcu
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)
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SELECT
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c.table_schema,
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c.table_name,
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c.column_name AS table_column_name,
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c.view_schema,
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c.view_name,
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c.view_column_name
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FROM view_columns AS vc, candidates AS c
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WHERE
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vc.view_oid = c.view_oid AND
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vc.column_name = c.view_column_name
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ORDER BY c.view_schema, c.view_name, c.table_name, c.view_column_name
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select
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c.table_schema,
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c.table_name,
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c.column_name as table_column_name,
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c.view_schema,
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c.view_name,
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c.view_column_name
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from view_columns as vc, candidates as c
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where
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vc.view_oid = c.view_oid
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and vc.column_name = c.view_column_name
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order by c.view_schema, c.view_name, c.table_name, c.view_column_name
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|]
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synonymFromRow :: [Column] -> (Text,Text,Text,Text,Text,Text) -> Maybe (Column,Column)
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