Simplify code by making use of new function available in nanoarrow

0.7.0.

Author: anthony-tuininga

src/oracledb/impl/arrow/array.pyx

@@ -382,7 +382,7 @@ cdef class ArrowArrayImpl:
             ArrowDecimalSetBytes(&decimal, ptr + index * 16)
             ArrowBufferInit(&buf)
             try:
-                _check_nanoarrow(ArrowDecimalAppendDigitsToBuffer(
+                _check_nanoarrow(ArrowDecimalAppendStringToBuffer(
                     &decimal, &buf
                 ))
                 return buf.data[:buf.size_bytes]

src/oracledb/impl/arrow/utils.pyx

@@ -118,7 +118,7 @@ cdef extern from "nanoarrow.c":
                                                 void *private_data)
     void ArrowBufferInit(ArrowBuffer* buffer)
     void ArrowBufferReset(ArrowBuffer* buffer)
-    ArrowErrorCode ArrowDecimalAppendDigitsToBuffer(const ArrowDecimal* decimal,
+    ArrowErrorCode ArrowDecimalAppendStringToBuffer(const ArrowDecimal* decimal,
                                                     ArrowBuffer* buffer)
     void ArrowDecimalInit(ArrowDecimal* decimal, int32_t bitwidth,
                           int32_t precision, int32_t scale)

src/oracledb/impl/base/converters.pyx

@@ -83,8 +83,6 @@ cdef object convert_arrow_to_oracle_data(OracleMetadata metadata,
     elif arrow_type == NANOARROW_TYPE_DECIMAL128:
         temp_bytes = arrow_array.get_decimal(array_index, &data.is_null)
         if not data.is_null:
-            temp_bytes = temp_bytes[:-arrow_array.scale] + b"." + \
-                    temp_bytes[-arrow_array.scale:]
             convert_bytes_to_oracle_data(&data.buffer, temp_bytes)
             return temp_bytes
     elif arrow_type in (NANOARROW_TYPE_LIST, NANOARROW_TYPE_FIXED_SIZE_LIST):