/*
 * Copyright (c) 2015, 2016 Oracle and/or its affiliates. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; version 2 of the
 * License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301  USA
 */
syntax = "proto2";

// ifdef PROTOBUF_LITE: option optimize_for = LITE_RUNTIME;

// Resultsets
// ``````````
//
// Executing a statement against the server may result in zero or more
// Resultsets followed by zero or one Resultset of the ``OUT`` parameters.
//
// A Resultset consists of:
//
// * one or more :protobuf:msg:`Polarx.Resultset::ColumnMetaData`
// * zero or more :protobuf:msg:`Polarx.Resultset::Row`
//
// It is followed by:
//
// * a :protobuf:msg:`Polarx.Resultset::FetchDoneMoreResultsets` if more
//   resultsets are following
// * a :protobuf:msg:`Polarx.Resultset::FetchDoneMoreOutParams` if more
//   Resultset of ``OUT`` parameters is following
// * a :protobuf:msg:`Polarx.Resultset::FetchDone` if the last resultset
//   was sent
//
// .. uml::
//
//   ...
//   loop has more resultsets
//     group resultset
//       loop has more columns
//         server --> client: ColumnMetaData
//       end
//       loop has more rows
//         server --> client: Row
//       end
//     end
//     alt has more resultsets
//       server --> client: FetchDoneMoreResultsets
//     end
//   end
//   loop has more OUT-paramsets
//     server --> client: FetchDoneMoreOutParams
//     group resultset
//       loop has more columns
//         server --> client: ColumnMetaData
//       end
//       loop has more rows
//         server --> client: Row
//       end
//     end
//   end
//   server --> client: FetchDone
//   ...
//
// Examples
// ````````
//
// .. rubric:: No Resultset
//
// A ``INSERT`` statement usually doesn't send any resultset which results in only
// a ``FetchDone``.
//
// .. uml::
//
//   server --> client: FetchDone
//
// .. rubric:: Empty Resultset
//
// ``SELECT 1 LIMIT 0`` results in a empty resultset:
//
// .. uml::
//
//   server --> client: ColumnMetaData(.name = "1", .type = INT)
//   server --> client: FetchDone
//
// .. rubric:: Multi Resultset
//
// ``CALL`` may result in multiple resultsets.
//
// .. uml::
//
//   server --> client: ColumnMetaData(.name = "1", .type = INT)
//   server --> client: Row
//   server --> client: FetchDoneMoreResultsets
//   server --> client: ColumnMetaData(.name = "1", .type = INT)
//   server --> client: Row
//   server --> client: FetchDone
//
// .. rubric:: OUT params
//
// ``CALL`` may result OUT parameters only
//
// .. uml::
//
//   server --> client: FetchDoneMoreOutParams
//   server --> client: ColumnMetaData(.name = "1", .type = INT)
//   server --> client: Row
//   server --> client: FetchDone



package Polarx.Resultset;
option java_package = "com.mysql.cj.polarx.protobuf";

// resultsets are finished, OUT paramset is next
message FetchDoneMoreOutParams {
}

// resultset and out-params are finished, but more resultsets available
message FetchDoneMoreResultsets {
}

// all resultsets are finished
message FetchDone {
  optional uint64 examined_row_count = 1;
  optional bytes chosen_index = 2;
}

// meta data of a Column
//
// .. note:: the encoding used for the different ``bytes`` fields in the meta data is externally
//   controlled.
//   .. seealso:: https://dev.mysql.com/doc/refman/5.0/en/charset-connection.html
//
// .. note::
//   The server may not set the ``original_{table|name}`` fields if they are equal to the plain
//   ``{table|name}`` field.
//
//   A client has to reconstruct it like::
//
//     if .original_name is empty and .name is not empty:
//       .original_name = .name
//
//     if .original_table is empty and .table is not empty:
//       .original_table = .table
//
// .. note::
//   ``compact metadata format`` can be requested by the client. In that case only ``.type`` is set and
//   all other fields are empty.
//
//
// :param type:
//   .. table:: Expected Datatype of Polarx.Resultset.Row per SQL Type for non NULL values
//
//     ================= ============ ======= ========== ====== ========
//     SQL Type          .type        .length .frac_dig  .flags .charset
//     ================= ============ ======= ========== ====== ========
//     TINY              SINT         x
//     TINY UNSIGNED     UINT         x                  x
//     SHORT             SINT         x
//     SHORT UNSIGNED    UINT         x                  x
//     INT24             SINT         x
//     INT24 UNSIGNED    UINT         x                  x
//     INT               SINT         x
//     INT UNSIGNED      UINT         x                  x
//     LONGLONG          SINT         x
//     LONGLONG UNSIGNED UINT         x                  x
//     DOUBLE            DOUBLE       x       x          x
//     FLOAT             FLOAT        x       x          x
//     DECIMAL           DECIMAL      x       x          x
//     VARCHAR,CHAR,...  BYTES        x                  x      x
//     GEOMETRY          BYTES
//     TIME              TIME         x
//     DATE              DATETIME     x
//     DATETIME          DATETIME     x
//     YEAR              UINT         x                  x
//     TIMESTAMP         DATETIME     x
//     SET               SET                                    x
//     ENUM              ENUM                                   x
//     NULL              BYTES
//     BIT               BIT          x
//     ================= ============ ======= ========== ====== ========
//
//   .. note:: the SQL "NULL" value is sent as an empty field value in :protobuf:msg:`Polarx.Resultset::Row`
//   .. seealso:: protobuf encoding of primitive datatypes are decribed in https://developers.google.com/protocol-buffers/docs/encoding
//
//   SINT
//
//     ``.length``
//       maximum number of displayable decimal digits (including minus sign) of the type
//
//       .. note::
//         valid range is 0-255, but usually you'll see 1-20
//
//       =============== ==
//       SQL Type        max digits per type
//       =============== ==
//       TINY SIGNED      4
//       SHORT SIGNED     6
//       INT24 SIGNED     8
//       INT SIGNED      11
//       LONGLONG SIGNED 20
//       =============== ==
//
//       .. seealso:: definition of ``M`` in https://dev.mysql.com/doc/refman/5.5/en/numeric-type-overview.html
//
//     ``value``
//       variable length encoded signed 64 integer
//
//   UINT
//
//     ``.flags & 1`` (zerofill)
//       the client has to left pad with 0's up to .length
//
//     ``.length``
//       maximum number of displayable decimal digits of the type
//
//       .. note::
//         valid range is 0-255, but usually you'll see 1-20
//
//       ================= ==
//       SQL Type          max digits per type
//       ================= ==
//       TINY UNSIGNED      3
//       SHORT UNSIGNED     5
//       INT24 UNSIGNED     8
//       INT UNSIGNED      10
//       LONGLONG UNSIGNED 20
//       ================= ==
//
//       .. seealso:: definition of ``M`` in https://dev.mysql.com/doc/refman/5.5/en/numeric-type-overview.html
//
//     ``value``
//       variable length encoded unsigned 64 integer
//
//   BIT
//
//     ``.length``
//       maximum number of displayable binary digits
//
//       .. note:: valid range for M of the ``BIT`` type is 1 - 64
//       .. seealso:: https://dev.mysql.com/doc/refman/5.5/en/numeric-type-overview.html
//
//     ``value``
//       variable length encoded unsigned 64 integer
//
//   DOUBLE
//
//     ``.length``
//       maximum number of displayable decimal digits (including the decimal point and ``.fractional_digits``)
//
//     ``.fractional_digits``
//       maximum number of displayable decimal digits following the decimal point
//
//     ``value``
//       encoded as Protobuf's 'double'
//
//   FLOAT
//
//     ``.length``
//       maximum number of displayable decimal digits (including the decimal point and ``.fractional_digits``)
//
//     ``.fractional_digits``
//       maximum number of displayable decimal digits following the decimal point
//
//     ``value``
//       encoded as Protobuf's 'float'
//
//   BYTES, ENUM
//     BYTES is used for all opaque byte strings that may have a charset
//
//       * TINYBLOB, BLOB, MEDIUMBLOB, LONGBLOB
//       * TINYTEXT, TEXT, MEDIUMTEXT, LONGTEXT
//       * VARCHAR, VARBINARY
//       * CHAR, BINARY
//       * ENUM
//
//     ``.length``
//       the maximum length of characters of the underlying type
//
//     ``.flags & 1`` (rightpad)
//       if the length of the field is less than ``.length``, the receiver is
//       supposed to add padding characters to the right end of the string.
//       If the ``.charset`` is "binary", the padding character is ``0x00``,
//       otherwise it is a space character as defined by that character set.
//
//       ============= ======= ======== =======
//       SQL Type      .length .charset .flags
//       ============= ======= ======== =======
//       TINYBLOB      256     binary
//       BLOB          65535   binary
//       VARCHAR(32)   32      utf8
//       VARBINARY(32) 32      utf8_bin
//       BINARY(32)    32      binary   rightpad
//       CHAR(32)      32      utf8     rightpad
//       ============= ======= ======== =======
//
//     ``value``
//       sequence of bytes with added one extra '\0' byte at the end. To obtain the
//       original string, the extra '\0' should be removed.
//       .. note:: the length of the string can be acquired with protobuf's field length() method
//         length of sequence-of-bytes = length-of-field - 1
//       .. note:: the extra byte allows to distinguish between a NULL and empty byte sequence
//
//   TIME
//     A time value.
//
//     ``value``
//       the following bytes sequence:
//
//         ``| negate [ | hour | [ | minutes | [ | seconds | [ | useconds | ]]]]``
//
//       * negate - one byte, should be one of: 0x00 for "+", 0x01 for "-"
//       * hour - optional variable length encoded unsigned64 value for the hour
//       * minutes - optional variable length encoded unsigned64 value for the minutes
//       * seconds - optional variable length encoded unsigned64 value for the seconds
//       * useconds - optional variable length encoded unsigned64 value for the microseconds
//
//       .. seealso:: protobuf encoding in https://developers.google.com/protocol-buffers/docs/encoding
//       .. note:: hour, minutes, seconds, useconds are optional if all the values to the right are 0
//
//       Example: 0x00 -> +00:00:00.000000
//
//   DATETIME
//     A date or date and time value.
//
//     ``value``
//       a sequence of variants, arranged as follows:
//
//         ``| year | month | day | [ | hour | [ | minutes | [ | seconds | [ | useconds | ]]]]``
//
//       * year - variable length encoded unsigned64 value for the year
//       * month - variable length encoded unsigned64 value for the month
//       * day - variable length encoded unsigned64 value for the day
//       * hour - optional variable length encoded unsigned64 value for the hour
//       * minutes - optional variable length encoded unsigned64 value for the minutes
//       * seconds - optional variable length encoded unsigned64 value for the seconds
//       * useconds - optional variable length encoded unsigned64 value for the microseconds
//
//       .. note:: hour, minutes, seconds, useconds are optional if all the values to the right are 0
//
//     ``.flags & 1`` (timestamp)
//
//       ============= =======
//       SQL Type      .flags
//       ============= =======
//       DATETIME
//       TIMESTAMP     1
//
//   DECIMAL
//     An arbitrary length number. The number is encoded as a single byte
//     indicating the position of the decimal point followed by the Packed BCD
//     encoded number. Packed BCD is used to simplify conversion to and
//     from strings and other native arbitrary precision math datatypes.
//     .. seealso:: packed BCD in https://en.wikipedia.org/wiki/Binary-coded_decimal
//
//     ``.length``
//       maximum number of displayable decimal digits (*excluding* the decimal point and sign, but including ``.fractional_digits``)
//
//       .. note:: should be in the range of 1 - 65
//
//     ``.fractional_digits``
//       is the decimal digits to display out of length
//
//       .. note:: should be in the range of 0 - 30
//
//     ``value``
//       the following bytes sequence:
//
//         ``| scale | BCD | sign | [0x0] |``
//
//       * scale - 8bit scale value (number of decimal digit after the '.')
//       * BCD - BCD encoded digits (4 bits for each digit)
//       * sign - sign encoded on 4 bits (0xc = "+", 0xd = "-")
//       * 0x0 - last 4bits if length(digits) % 2 == 0
//
//       Example: x04 0x12 0x34 0x01 0xd0 -> -12.3401
//
//   SET
//     A list of strings representing a SET of values.
//
//     ``value``
//       A sequence of 0 or more of protobuf's bytes (length prepended octets) or one of
//       the special sequences with a predefined meaning listed below.
//
//       Example (length of the bytes array shown in brackets):
//         * ``[0]`` - the NULL value
//         * ``[1] 0x00`` - a set containing a blank string ''
//         * ``[1] 0x01`` - this would be an invalid value, but is to be treated as the empty set
//         * ``[2] 0x01 0x00`` - a set with a single item, which is the '\0' character
//         * ``[8] 0x03 F O O 0x03 B A R`` - a set with 2 items: FOO,BAR
//
//
// :param name: name of the column
// :param original_name: name of the column before an alias was applied
// :param table: name of the table the column orginates from
// :param original_table: name of the table the column orginates from before an alias was applied
// :param schema: schema the column originates from
// :param catalog:
//   catalog the schema originates from
//
//   .. note::
//     as there is current no support for catalogs in MySQL, don't expect this field to be set.
//     In the MySQL C/S protocol the field had the value ``def`` all the time.
//
// :param fractional_digits: displayed factional decimal digits for floating point and fixed point numbers
// :param length: maximum count of displayable characters of .type
// :param flags:
//   ``.type`` specific flags
//
//   ======= ====== ===========
//   type    value  description
//   ======= ====== ===========
//   UINT    0x0001 zerofill
//   DOUBLE  0x0001 unsigned
//   FLOAT   0x0001 unsigned
//   DECIMAL 0x0001 unsigned
//   BYTES   0x0001 rightpad
//   ======= ====== ===========
//
//   ====== ================
//   value  description
//   ====== ================
//   0x0010 NOT_NULL
//   0x0020 PRIMARY_KEY
//   0x0040 UNIQUE_KEY
//   0x0080 MULTIPLE_KEY
//   0x0100 AUTO_INCREMENT
//   ====== ================
//
//   default: 0
// :param content_type:
//   a hint about the higher-level encoding of a BYTES field
//
//   ====== ====== ===========
//   type   value  description
//   ====== ====== ===========
//   BYTES  0x0001 GEOMETRY (WKB encoding)
//   BYTES  0x0002 JSON (text encoding)
//   BYTES  0x0003 XML (text encoding)
//   ====== ====== ===========
//
//   .. note::
//     this list isn't comprehensive. As guideline: the field's value is expected
//     to pass a validator check on client and server if this field is set.
//     If the server adds more internal datatypes that rely on BLOB storage
//     like image manipulation, seeking into complex types in BLOBs, ... more
//     types will be added.
//
message ColumnMetaData {
  enum FieldType {
    SINT     = 1;
    UINT     = 2;

    DOUBLE   = 5;
    FLOAT    = 6;

    BYTES    = 7;

    TIME     = 10;
    DATETIME = 12;
    SET      = 15;
    ENUM     = 16;
    BIT      = 17;

    DECIMAL  = 18;
  }

  enum OriginalType {
    MYSQL_TYPE_DECIMAL = 0;
    MYSQL_TYPE_TINY = 1;
    MYSQL_TYPE_SHORT = 2;
    MYSQL_TYPE_LONG = 3;
    MYSQL_TYPE_FLOAT = 4;
    MYSQL_TYPE_DOUBLE = 5;
    MYSQL_TYPE_NULL = 6;
    MYSQL_TYPE_TIMESTAMP = 7;
    MYSQL_TYPE_LONGLONG = 8;
    MYSQL_TYPE_INT24 = 9;
    MYSQL_TYPE_DATE = 10;
    MYSQL_TYPE_TIME = 11;
    MYSQL_TYPE_DATETIME = 12;
    MYSQL_TYPE_YEAR = 13;
    MYSQL_TYPE_NEWDATE = 14;
    MYSQL_TYPE_VARCHAR = 15;
    MYSQL_TYPE_BIT = 16;
    MYSQL_TYPE_TIMESTAMP2 = 17;
    MYSQL_TYPE_DATETIME2 = 18;
    MYSQL_TYPE_TIME2 = 19;
    MYSQL_TYPE_JSON = 245;
    MYSQL_TYPE_NEWDECIMAL = 246;
    MYSQL_TYPE_ENUM = 247;
    MYSQL_TYPE_SET = 248;
    MYSQL_TYPE_TINY_BLOB = 249;
    MYSQL_TYPE_MEDIUM_BLOB = 250;
    MYSQL_TYPE_LONG_BLOB = 251;
    MYSQL_TYPE_BLOB = 252;
    MYSQL_TYPE_VAR_STRING = 253;
    MYSQL_TYPE_STRING = 254;
    MYSQL_TYPE_GEOMETRY = 255;
  }

  // datatype of the field in a row
  required FieldType type = 1;
  required OriginalType original_type = 2;

  optional bytes name = 3;
  optional bytes original_name = 4;

  optional bytes table = 5;
  optional bytes original_table = 6;

  optional bytes schema = 7;
  optional bytes catalog = 8;

  optional uint64 collation = 9;

  optional uint32 fractional_digits = 10;

  optional uint32 length = 11;

  optional uint32 flags = 12;

  optional uint32 content_type = 13;

  optional uint32 original_flags = 14;
}

//   Row in a Resultset
//
//   a row is represented as a list of fields encoded as byte blobs.
//   Blob of size 0 represents the NULL value. Otherwise, if it contains at least
//   one byte, it encodes a non-null value of the field using encoding appropriate for the
//   type of the value given by ``ColumnMetadata``, as specified
//   in the :protobuf:msg:`Polarx.Resultset::ColumnMetaData` description.
//
message Row {
  repeated bytes field = 1;
}

message TokenDone {
  optional int32 token_left = 1 [ default = 0];
}

// One chunk of a result set.
message Chunk {
  required uint32 row_count = 1;
  repeated Column columns = 2;
}

// One column in a chunk.
//
// ## Null Bitmap
//
// If not set, then there's no null value in this column.
//
// Encoding: each byte starts with least significant bit.
// For example, the following bitmap
// [true, false, false, true, true, false, true, true]
// should be encoded as
// 0x11011001
//
// ## Column Value
//
// It contains several optional column values, and which one should be set is determined by column's mysql type.
// For example, if it's a LONG type, then `fixed_size_column` will be set.
message Column {
  optional bytes null_bitmap = 1;
  optional FixedSizeColumn fixed_size_column = 2;
  optional VariableSizeColumn variable_size_column = 3;
}

// A column with fixed width values, and it's designed for following mysql numeric types:
//    ==============================
//    | SQL Type | Bytes Per Value |
//    ==============================
//    | TINY     | 1               |
//    ------------------------------
//    | SHORT    | 2               |
//    ------------------------------
//    | INT24    | 3               |
//    ------------------------------
//    | LONG     | 4               |
//    ------------------------------
//    | LONGLONG | 8               |
//    ------------------------------
//    | FLOAT    | 4               |
//    ------------------------------
//    | DOUBLE   | 8               |
//    ==============================
//
// Byte order should be set by client using capability.
message FixedSizeColumn {
  required bytes value = 1;
}

message VariableSizeColumn {
  required bytes value = 1;
}