Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/11444#discussion_r54980428
--- Diff: python/pyspark/sql/types.py ---
@@ -681,6 +681,129 @@ def __eq__(self, other):
for v in [ArrayType, MapType, StructType])
+_FIXED_DECIMAL = re.compile("decimal\\(\\s*(\\d+)\\s*,\\s*(\\d+)\\s*\\)")
+
+
+_BRACKETS = {'(': ')', '[': ']', '{': '}'}
+
+
+def _parse_basic_datatype_string(s):
+ if s in _all_atomic_types.keys():
+ return _all_atomic_types[s]()
+ elif s == "int":
+ return IntegerType()
+ elif _FIXED_DECIMAL.match(s):
+ m = _FIXED_DECIMAL.match(s)
+ return DecimalType(int(m.group(1)), int(m.group(2)))
+ else:
+ raise ValueError("Could not parse datatype: %s" % s)
+
+
+def _ignore_brackets_split(s, separator):
+ """
+ Splits the given string by given separator, but ignore separators
inside brackets pairs, e.g.
+ given "a,b" and separator ",", it will return ["a", "b"], but given
"a<b,c>, d", it will return
+ ["a<b,c>", "d"].
+ """
+ parts = []
+ buf = ""
+ level = 0
+ for c in s:
+ if c in _BRACKETS.keys():
+ level += 1
+ buf += c
+ elif c in _BRACKETS.values():
+ if level == 0:
+ raise ValueError("Brackets are not correctly paired: %s" %
s)
+ level -= 1
+ buf += c
+ elif c == separator and level > 0:
+ buf += c
+ elif c == separator:
+ parts.append(buf)
+ buf = ""
+ else:
+ buf += c
+
+ if len(buf) == 0:
+ raise ValueError("The %s cannot be the last char: %s" %
(separator, s))
+ parts.append(buf)
+ return parts
+
+
+def _parse_struct_type_string(s):
--- End diff --
oh sorry the name is confusing. It should be `_parse_struct_fields_string`.
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