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Hi there,
When I query the empty string, I find that the value I get is null, So I debug the source code to find the empty string is converted to null.
why it is designed this way?
Below is the source code section.
@Nullable
private Object toValue(@Nullable final String strValue, final @Nonnull FluxColumn column) {
Arguments.checkNotNull(column, "column");
// Default value
if (strValue == null || strValue.isEmpty()) {
String defaultValue = column.getDefaultValue();
if (defaultValue == null || defaultValue.isEmpty()) {
return null;
}
return toValue(defaultValue, column);
}
String dataType = column.getDataType();
switch (dataType) {
case "boolean":
return Boolean.valueOf(strValue);
case "unsignedLong":
return Long.parseUnsignedLong(strValue);
case "long":
return Long.parseLong(strValue);
case "double":
switch (strValue) {
case "+Inf":
return Double.POSITIVE_INFINITY;
case "-Inf":
return Double.NEGATIVE_INFINITY;
default:
return Double.parseDouble(strValue);
}
case "base64Binary":
return Base64.getDecoder().decode(strValue);
case "dateTime:RFC3339":
case "dateTime:RFC3339Nano":
return Instant.parse(strValue);
case "duration":
return Duration.ofNanos(Long.parseUnsignedLong(strValue));
default:
case "string":
return strValue;
}
}
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