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typeinferer_test.go
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// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package plan_test
import (
. "github.com/pingcap/check"
"github.com/pingcap/tidb"
"github.com/pingcap/tidb/ast"
"github.com/pingcap/tidb/context"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/plan"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/util/charset"
"github.com/pingcap/tidb/util/testkit"
"github.com/pingcap/tidb/util/testleak"
)
var _ = Suite(&testTypeInferrerSuite{})
type testTypeInferrerSuite struct {
}
func (ts *testTypeInferrerSuite) TestInferType(c *C) {
store, err := tidb.NewStore(tidb.EngineGoLevelDBMemory)
c.Assert(err, IsNil)
defer store.Close()
testKit := testkit.NewTestKit(c, store)
testKit.MustExec("use test")
testKit.MustExec("create table t (c1 int, c2 double, c3 text)")
cases := []struct {
expr string
tp byte
chs string
}{
{"c1", mysql.TypeLong, charset.CharsetBin},
{"+1", mysql.TypeLonglong, charset.CharsetBin},
{"-1", mysql.TypeLonglong, charset.CharsetBin},
{"-'1'", mysql.TypeDouble, charset.CharsetBin},
{"~1", mysql.TypeLonglong, charset.CharsetBin},
{"!true", mysql.TypeLonglong, charset.CharsetBin},
{"c1 is true", mysql.TypeLonglong, charset.CharsetBin},
{"c2 is null", mysql.TypeLonglong, charset.CharsetBin},
{"isnull(1/0)", mysql.TypeLonglong, charset.CharsetBin},
{"cast(1 as decimal)", mysql.TypeNewDecimal, charset.CharsetBin},
{"1 and 1", mysql.TypeLonglong, charset.CharsetBin},
{"1 or 1", mysql.TypeLonglong, charset.CharsetBin},
{"1 xor 1", mysql.TypeLonglong, charset.CharsetBin},
{"'1' & 2", mysql.TypeLonglong, charset.CharsetBin},
{"'1' | 2", mysql.TypeLonglong, charset.CharsetBin},
{"'1' ^ 2", mysql.TypeLonglong, charset.CharsetBin},
{"'1' << 1", mysql.TypeLonglong, charset.CharsetBin},
{"'1' >> 1", mysql.TypeLonglong, charset.CharsetBin},
{"1 + '1'", mysql.TypeDouble, charset.CharsetBin},
{"1 + 1.1", mysql.TypeNewDecimal, charset.CharsetBin},
{"1 div 2", mysql.TypeLonglong, charset.CharsetBin},
{"1 / 2", mysql.TypeNewDecimal, charset.CharsetBin},
{"1 > any (select 1)", mysql.TypeLonglong, charset.CharsetBin},
{"exists (select 1)", mysql.TypeLonglong, charset.CharsetBin},
{"1 in (2, 3)", mysql.TypeLonglong, charset.CharsetBin},
{"'abc' like 'abc'", mysql.TypeLonglong, charset.CharsetBin},
{"'abc' rlike 'abc'", mysql.TypeLonglong, charset.CharsetBin},
{"(1+1)", mysql.TypeLonglong, charset.CharsetBin},
// Functions
{"version()", mysql.TypeVarString, "utf8"},
{"count(c1)", mysql.TypeLonglong, charset.CharsetBin},
{"abs(1)", mysql.TypeLonglong, charset.CharsetBin},
{"abs(1.1)", mysql.TypeNewDecimal, charset.CharsetBin},
{"abs(cast(\"20150817015609\" as DATETIME))", mysql.TypeDouble, charset.CharsetBin},
{"IF(1>2,2,3)", mysql.TypeLonglong, charset.CharsetBin},
{"IFNULL(1,0)", mysql.TypeLonglong, charset.CharsetBin},
{"POW(2,2)", mysql.TypeDouble, charset.CharsetBin},
{"POWER(2,2)", mysql.TypeDouble, charset.CharsetBin},
{"rand()", mysql.TypeDouble, charset.CharsetBin},
{"curdate()", mysql.TypeDate, charset.CharsetBin},
{"current_date()", mysql.TypeDate, charset.CharsetBin},
{"DATE('2003-12-31 01:02:03')", mysql.TypeDate, charset.CharsetBin},
{"curtime()", mysql.TypeDuration, charset.CharsetBin},
{"current_time()", mysql.TypeDuration, charset.CharsetBin},
{"curtime()", mysql.TypeDuration, charset.CharsetBin},
{"current_timestamp()", mysql.TypeDatetime, charset.CharsetBin},
{"microsecond('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"second('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"minute('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"hour('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"day('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"week('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"month('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"year('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"dayofweek('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"dayofmonth('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"dayofyear('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"weekday('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"weekofyear('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"yearweek('2009-12-31 23:59:59.000010')", mysql.TypeLonglong, charset.CharsetBin},
{"found_rows()", mysql.TypeLonglong, charset.CharsetBin},
{"length('tidb')", mysql.TypeLonglong, charset.CharsetBin},
{"now()", mysql.TypeDatetime, charset.CharsetBin},
{"from_unixtime(1447430881)", mysql.TypeDatetime, charset.CharsetBin},
{"from_unixtime(1447430881, '%Y %D %M %h:%i:%s %x')", mysql.TypeVarString, "utf8"},
{"sysdate()", mysql.TypeDatetime, charset.CharsetBin},
{"dayname('2007-02-03')", mysql.TypeVarString, "utf8"},
{"version()", mysql.TypeVarString, "utf8"},
{"database()", mysql.TypeVarString, "utf8"},
{"user()", mysql.TypeVarString, "utf8"},
{"current_user()", mysql.TypeVarString, "utf8"},
{"CONCAT('T', 'i', 'DB')", mysql.TypeVarString, "utf8"},
{"CONCAT_WS('-', 'T', 'i', 'DB')", mysql.TypeVarString, "utf8"},
{"left('TiDB', 2)", mysql.TypeVarString, "utf8"},
{"lower('TiDB')", mysql.TypeVarString, "utf8"},
{"lcase('TiDB')", mysql.TypeVarString, "utf8"},
{"repeat('TiDB', 3)", mysql.TypeVarString, "utf8"},
{"replace('TiDB', 'D', 'd')", mysql.TypeVarString, "utf8"},
{"upper('TiDB')", mysql.TypeVarString, "utf8"},
{"ucase('TiDB')", mysql.TypeVarString, "utf8"},
{"trim(' TiDB ')", mysql.TypeVarString, "utf8"},
{"ltrim(' TiDB')", mysql.TypeVarString, "utf8"},
{"rtrim('TiDB ')", mysql.TypeVarString, "utf8"},
{"connection_id()", mysql.TypeLonglong, charset.CharsetBin},
{"if(1>2, 2, 3)", mysql.TypeLonglong, charset.CharsetBin},
{"case c1 when null then 2 when 2 then 1.1 else 1 END", mysql.TypeNewDecimal, charset.CharsetBin},
{"case c1 when null then 2 when 2 then 'tidb' else 1.1 END", mysql.TypeVarchar, "utf8"},
{"greatest(1, 2, 3)", mysql.TypeLonglong, charset.CharsetBin},
{"greatest('TiDB', 'D', 'd')", mysql.TypeVarString, "utf8"},
{"greatest(1.1, 2.2)", mysql.TypeNewDecimal, charset.CharsetBin},
{"greatest('TiDB', 3)", mysql.TypeVarString, "utf8"},
{"hex('TiDB')", mysql.TypeVarString, "utf8"},
{"hex(12)", mysql.TypeVarString, "utf8"},
{"unhex('TiDB')", mysql.TypeVarString, "utf8"},
{"unhex(12)", mysql.TypeVarString, "utf8"},
}
for _, ca := range cases {
ctx := testKit.Se.(context.Context)
stmts, err := tidb.Parse(ctx, "select "+ca.expr+" from t")
c.Assert(err, IsNil)
c.Assert(stmts, HasLen, 1)
stmt := stmts[0].(*ast.SelectStmt)
is := sessionctx.GetDomain(ctx).InfoSchema()
err = plan.ResolveName(stmt, is, ctx)
c.Assert(err, IsNil)
plan.InferType(ctx.GetSessionVars().StmtCtx, stmt)
tp := stmt.GetResultFields()[0].Column.Tp
chs := stmt.GetResultFields()[0].Column.Charset
c.Assert(tp, Equals, ca.tp, Commentf("Tp for %s", ca.expr))
c.Assert(chs, Equals, ca.chs, Commentf("Charset for %s", ca.expr))
}
}
func (s *testTypeInferrerSuite) TestColumnInfoModified(c *C) {
defer testleak.AfterTest(c)()
store, err := tidb.NewStore(tidb.EngineGoLevelDBMemory)
c.Assert(err, IsNil)
defer store.Close()
testKit := testkit.NewTestKit(c, store)
testKit.MustExec("use test")
testKit.MustExec("drop table if exists tab0")
testKit.MustExec("CREATE TABLE tab0(col0 INTEGER, col1 INTEGER, col2 INTEGER)")
testKit.MustExec("SELECT + - (- CASE + col0 WHEN + CAST( col0 AS SIGNED ) THEN col1 WHEN 79 THEN NULL WHEN + - col1 THEN col0 / + col0 END ) * - 16 FROM tab0")
ctx := testKit.Se.(context.Context)
is := sessionctx.GetDomain(ctx).InfoSchema()
tbl, _ := is.TableByName(model.NewCIStr("test"), model.NewCIStr("tab0"))
col := table.FindCol(tbl.Cols(), "col1")
c.Assert(col.Tp, Equals, mysql.TypeLong)
}