Function CopyStringVal

be/src/exprs/aggregate-functions-ir.cc:167–181

This function initializes StringVal 'dst' with a newly allocated buffer of 'buf_len' bytes and copies the content of StringVal 'src' into it. If allocation fails, 'dst' will be set to a null string.

// 'buf_len' bytes and copies the content of StringVal 'src' into it.
// If allocation fails, 'dst' will be set to a null string.
static void CopyStringVal(FunctionContext* ctx, const StringVal& src, StringVal* dst) {
  if (src.is_null) {
    *dst = StringVal::null();
  } else {
    uint8_t* copy = ctx->Allocate(src.len);
    if (UNLIKELY(copy == NULL)) {
      // Zero-length allocation always returns a hard-coded pointer.
      DCHECK(src.len != 0 && !ctx->impl()->state()->GetQueryStatus().ok());
      *dst = StringVal::null();
    } else {
      *dst = StringVal(copy, src.len);
      memcpy(dst->ptr, src.ptr, src.len);
    }
  }
}

// Converts any UDF Val Type to a string representation
template <typename T>