CONST :consttype relpartbound pg_class

select pt.relpartbound

from pg_class base_tb join pg_inherits i on i.inhparent = base_tb.oid join pg_class pt on pt.oid = i.inhrelid

WHERE pt.relpartbound like '%PARTITIONRANGEDATUM%';

{PARTITIONBOUNDSPEC :strategy r :is_default false :modulus 0 :remainder 0 :listdatums <> :lowerdatums ({PARTITIONRANGEDATUM :kind 0 :value {CONST :consttype 1184 :consttypmod -1 :constcollid 0 :constlen 8 :constbyval true :constisnull false :location 113 :constvalue 8 [ 0 -76 -57 -34 -54 -56 2 0 ]} :location 113}) :upperdatums ({PARTITIONRANGEDATUM :kind 0 :value {CONST :consttype 1184 :consttypmod -1 :constcollid 0 :constlen 8 :constbyval true :constisnull false :location 131 :constvalue 8 [ 0 -12 4 94 38 -53 2 0 ]} :location 131}) :location 107}

{PARTITIONBOUNDSPEC :strategy r :is_default false :modulus 0 :remainder 0 :listdatums <> :lowerdatums ({PARTITIONRANGEDATUM :kind 0 :value {CONST :consttype 23 :consttypmod -1 :constcollid 0 :constlen 4 :constbyval true :constisnull false :location 112 :constvalue 4 [ 0 0 0 0 0 0 0 0 ]} :location 112}) :upperdatums ({PARTITIONRANGEDATUM :kind 0 :value {CONST :consttype 23 :consttypmod -1 :constcollid 0 :constlen 4 :constbyval true :constisnull false :location 119 :constvalue 4 [ 1 0 0 0 0 0 0 0 ]} :location 119}) :location 106}