class_docstr: CsvSchemaBuilder is for building a :class:`~CsvSchema`, corresponding to Java
  ``com.fasterxml.jackson.dataformat.csv.CsvSchema.Builder`` class.
  
  .. versionadded:: 1.16.0
docstr: Set quote char, default to ``"``.
docstr_tok: ["Set","quote","char",",","default","to","``","``","``","."]
code: def set_quote_char(self, char: str):
      """
      Set quote char, default to ``"``.
      """
      if len(char) != 1:
          raise ValueError(
              "Quote char must be a single char, got {}".format(char)
          )
      self._j_schema_builder.setQuoteChar(char)
      return self
  
imports: from typing import Optional, TYPE_CHECKING
  from pyflink.common.serialization import BulkWriterFactory, RowDataBulkWriterFactory, SerializationSchema, DeserializationSchema
  from pyflink.common.typeinfo import TypeInformation
  from pyflink.datastream.connectors.file_system import StreamFormat
  from pyflink.java_gateway import get_gateway
label_desc: Use image node_id 20 for calling the CsvSchemaBuilder obj's underlying member method code with example usage: obj.set_quote_char(char) and returns: self