doc: document the maximum char/varchar length value

Reported-by: Japin Li
Discussion: https://postgr.es/m/MEYP282MB1669B13E98AE531617CB1386B6979@MEYP282MB1669.AUSP282.PROD.OUTLOOK.COM

Backpatch-through: 10

diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml
index 4cc9e592708ba4e5767dafc48010c2a0d39a7f06..0258b192e0e4f18d3730efc45f841e78124d82a1 100644 (file)
--- a/doc/src/sgml/datatype.sgml
+++ b/doc/src/sgml/datatype.sgml
@@ -1217,6 +1217,8 @@ SELECT '52093.89'::money::numeric::float8;
     char(n) are aliases for character
     varying(n) and
     character(n), respectively.
+    If specified, the length must be greater than zero and cannot exceed
+    10485760.
     character without length specifier is equivalent to
     character(1). If character varying is used
     without length specifier, the type accepts strings of any size. The