Class SqlDelegatingConformance
- All Implemented Interfaces:
SqlConformance
SqlConformance
that delegates all methods to
another object. You can create a sub-class that overrides particular
methods.-
Field Summary
Fields inherited from interface org.apache.calcite.sql.validate.SqlConformance
DEFAULT, ORACLE_10, PRAGMATIC_2003, PRAGMATIC_99, STRICT_2003, STRICT_92, STRICT_99
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Constructor Summary
ModifierConstructorDescriptionprotected
SqlDelegatingConformance
(SqlConformance delegate) Creates a SqlDelegatingConformance. -
Method Summary
Modifier and TypeMethodDescriptionboolean
Whether directly alias array items in UNNEST.boolean
Whether this dialect allows character literals as column aliases.boolean
Whether to allow SQL syntax "ROW(expr1, expr2, expr3)
".boolean
Whether to allow mixing table columns with extended columns inINSERT
(orUPSERT
).boolean
Whether TRIM should support more than one trim character.boolean
Whether to allow geo-spatial extensions, including the GEOMETRY type.boolean
Whether to allow hyphens in an unquoted table name.boolean
Whether to allow lenient type coercions.boolean
Whether to allow parentheses to be specified in calls to niladic functions and procedures (that is, functions and procedures with no parameters).boolean
Whether interval literals should allow plural time units such as "YEARS" and "DAYS" in interval literals.boolean
Whether to allow a qualified common column in a query that has a NATURAL join or a join with a USING clause.boolean
WhetherCROSS APPLY
andOUTER APPLY
operators are allowed in the parser.boolean
Whether the bang-equal token != is allowed as an alternative to <> in the parser.boolean
WhetherFROM
clause is required in aSELECT
statement.boolean
Whether to allow aliases from theSELECT
clause to be used as column names in theGROUP BY
clause.boolean
WhetherGROUP BY 2
is interpreted to mean 'group by the 2nd column in the select list'.boolean
Whether to allow aliases from theSELECT
clause to be used as column names in theHAVING
clause.boolean
Whether to allowINSERT
(orUPSERT
) with no column list but fewer values than the target table.boolean
Whether this dialect supports features from a wide variety of dialects.boolean
Whether to allow the SQL syntax "LIMIT start, count
".boolean
WhetherMINUS
is allowed as an alternative toEXCEPT
in the parser.boolean
Whether to allow the SQL syntax "OFFSET start LIMIT count
" (that is,OFFSET
beforeLIMIT
, in addition toLIMIT
beforeOFFSET
andOFFSET
beforeFETCH
).boolean
Whether the "%" operator is allowed by the parser as an alternative to themod
function.boolean
Whether this dialect uses$
(dollar) for indexing capturing groups in the replacement string of regular expression functions such asREGEXP_REPLACE
.boolean
Whether 'ORDER BY x
' is interpreted to mean 'sort by the select list item whose alias is x' even if there is a column called x.boolean
Whether "empno" is invalid in "select empno as x from emp order by empno" because the alias "x" obscures it.boolean
Whether 'ORDER BY 2
' is interpreted to mean 'sort by the 2nd column in the select list'.boolean
WhetherVALUE
is allowed as an alternative toVALUES
in the parser.Controls the behavior of operators that are part of Standard SQL but nevertheless have different behavior in different databases.boolean
Whether the least restrictive type of a number of CHAR types of different lengths should be a VARCHAR type.boolean
Whether to split a quoted table name.
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Constructor Details
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SqlDelegatingConformance
Creates a SqlDelegatingConformance.
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Method Details
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isLiberal
public boolean isLiberal()Description copied from interface:SqlConformance
Whether this dialect supports features from a wide variety of dialects. This is enabled for the Babel parser, disabled otherwise.- Specified by:
isLiberal
in interfaceSqlConformance
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allowCharLiteralAlias
public boolean allowCharLiteralAlias()Description copied from interface:SqlConformance
Whether this dialect allows character literals as column aliases.For example,
SELECT empno, sal + comm AS 'remuneration' FROM Emp
Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.BIG_QUERY
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
,SqlConformanceEnum.SQL_SERVER_2008
; false otherwise.- Specified by:
allowCharLiteralAlias
in interfaceSqlConformance
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isGroupByAlias
public boolean isGroupByAlias()Description copied from interface:SqlConformance
Whether to allow aliases from theSELECT
clause to be used as column names in theGROUP BY
clause.Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.BIG_QUERY
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
; false otherwise.- Specified by:
isGroupByAlias
in interfaceSqlConformance
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isGroupByOrdinal
public boolean isGroupByOrdinal()Description copied from interface:SqlConformance
WhetherGROUP BY 2
is interpreted to mean 'group by the 2nd column in the select list'.Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.BIG_QUERY
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
,SqlConformanceEnum.PRESTO
; false otherwise.- Specified by:
isGroupByOrdinal
in interfaceSqlConformance
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isHavingAlias
public boolean isHavingAlias()Description copied from interface:SqlConformance
Whether to allow aliases from theSELECT
clause to be used as column names in theHAVING
clause.Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.BIG_QUERY
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
; false otherwise.- Specified by:
isHavingAlias
in interfaceSqlConformance
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isSortByOrdinal
public boolean isSortByOrdinal()Description copied from interface:SqlConformance
Whether 'ORDER BY 2
' is interpreted to mean 'sort by the 2nd column in the select list'.Among the built-in conformance levels, true in
SqlConformanceEnum.DEFAULT
,SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
,SqlConformanceEnum.ORACLE_10
,SqlConformanceEnum.ORACLE_12
,SqlConformanceEnum.PRAGMATIC_99
,SqlConformanceEnum.PRAGMATIC_2003
,SqlConformanceEnum.PRESTO
,SqlConformanceEnum.SQL_SERVER_2008
,SqlConformanceEnum.STRICT_92
; false otherwise.- Specified by:
isSortByOrdinal
in interfaceSqlConformance
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isSortByAlias
public boolean isSortByAlias()Description copied from interface:SqlConformance
Whether 'ORDER BY x
' is interpreted to mean 'sort by the select list item whose alias is x' even if there is a column called x.Among the built-in conformance levels, true in
SqlConformanceEnum.DEFAULT
,SqlConformanceEnum.BABEL
,SqlConformanceEnum.BIG_QUERY
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
,SqlConformanceEnum.ORACLE_10
,SqlConformanceEnum.ORACLE_12
,SqlConformanceEnum.SQL_SERVER_2008
,SqlConformanceEnum.STRICT_92
; false otherwise.- Specified by:
isSortByAlias
in interfaceSqlConformance
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isSortByAliasObscures
public boolean isSortByAliasObscures()Description copied from interface:SqlConformance
Whether "empno" is invalid in "select empno as x from emp order by empno" because the alias "x" obscures it.Among the built-in conformance levels, true in
SqlConformanceEnum.STRICT_92
; false otherwise.- Specified by:
isSortByAliasObscures
in interfaceSqlConformance
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isFromRequired
public boolean isFromRequired()Description copied from interface:SqlConformance
WhetherFROM
clause is required in aSELECT
statement.Among the built-in conformance levels, true in
SqlConformanceEnum.ORACLE_10
,SqlConformanceEnum.ORACLE_12
,SqlConformanceEnum.STRICT_92
,SqlConformanceEnum.STRICT_99
,SqlConformanceEnum.STRICT_2003
; false otherwise.- Specified by:
isFromRequired
in interfaceSqlConformance
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splitQuotedTableName
public boolean splitQuotedTableName()Description copied from interface:SqlConformance
Whether to split a quoted table name. If true,`x.y.z`
is parsed as if the user had written`x`.`y`.`z`
.Among the built-in conformance levels, true in
SqlConformanceEnum.BIG_QUERY
; false otherwise.- Specified by:
splitQuotedTableName
in interfaceSqlConformance
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allowHyphenInUnquotedTableName
public boolean allowHyphenInUnquotedTableName()Description copied from interface:SqlConformance
Whether to allow hyphens in an unquoted table name.If true,
SELECT * FROM foo-bar.baz-buzz
is valid, and is parsed as if the user had writtenSELECT * FROM `foo-bar`.`baz-buzz`
.Among the built-in conformance levels, true in
SqlConformanceEnum.BIG_QUERY
; false otherwise.- Specified by:
allowHyphenInUnquotedTableName
in interfaceSqlConformance
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isBangEqualAllowed
public boolean isBangEqualAllowed()Description copied from interface:SqlConformance
Whether the bang-equal token != is allowed as an alternative to <> in the parser.Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
,SqlConformanceEnum.ORACLE_10
,SqlConformanceEnum.ORACLE_12
,SqlConformanceEnum.PRESTO
; false otherwise.- Specified by:
isBangEqualAllowed
in interfaceSqlConformance
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isPercentRemainderAllowed
public boolean isPercentRemainderAllowed()Description copied from interface:SqlConformance
Whether the "%" operator is allowed by the parser as an alternative to themod
function.Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
,SqlConformanceEnum.PRESTO
; false otherwise.- Specified by:
isPercentRemainderAllowed
in interfaceSqlConformance
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isMinusAllowed
public boolean isMinusAllowed()Description copied from interface:SqlConformance
WhetherMINUS
is allowed as an alternative toEXCEPT
in the parser.Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.ORACLE_10
,SqlConformanceEnum.ORACLE_12
; false otherwise.Note: MySQL does not support
MINUS
orEXCEPT
(as of version 5.5).- Specified by:
isMinusAllowed
in interfaceSqlConformance
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isRegexReplaceCaptureGroupDollarIndexed
public boolean isRegexReplaceCaptureGroupDollarIndexed()Description copied from interface:SqlConformance
Whether this dialect uses$
(dollar) for indexing capturing groups in the replacement string of regular expression functions such asREGEXP_REPLACE
. If false, the dialect uses\\
(backslash) for indexing capturing groups.For example,
REGEXP_REPLACE("abc", "a(.)c", "X\\1")
in BigQuery is equivalent toREGEXP_REPLACE("abc", "a(.)c", "X$1")
in MySQL; both produce the result "Xb".Among the built-in conformance levels, false in
SqlConformanceEnum.BIG_QUERY
; true otherwise.- Specified by:
isRegexReplaceCaptureGroupDollarIndexed
in interfaceSqlConformance
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isApplyAllowed
public boolean isApplyAllowed()Description copied from interface:SqlConformance
WhetherCROSS APPLY
andOUTER APPLY
operators are allowed in the parser.APPLY
invokes a table-valued function for each row returned by a table expression. It is syntactic sugar:SELECT * FROM emp CROSS APPLY TABLE(promote(empno)
is equivalent to
SELECT * FROM emp CROSS JOIN LATERAL TABLE(promote(empno)
SELECT * FROM emp OUTER APPLY TABLE(promote(empno)
is equivalent to
SELECT * FROM emp LEFT JOIN LATERAL TABLE(promote(empno)
ON true
Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.ORACLE_12
,SqlConformanceEnum.SQL_SERVER_2008
; false otherwise.- Specified by:
isApplyAllowed
in interfaceSqlConformance
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isInsertSubsetColumnsAllowed
public boolean isInsertSubsetColumnsAllowed()Description copied from interface:SqlConformance
Whether to allowINSERT
(orUPSERT
) with no column list but fewer values than the target table.The N values provided are assumed to match the first N columns of the table, and for each of the remaining columns, the default value of the column is used. It is an error if any of these columns has no default value.
The default value of a column is specified by the
DEFAULT
clause in theCREATE TABLE
statement, or isNULL
if the column is not declaredNOT NULL
.Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.PRAGMATIC_99
,SqlConformanceEnum.PRAGMATIC_2003
; false otherwise.- Specified by:
isInsertSubsetColumnsAllowed
in interfaceSqlConformance
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allowAliasUnnestItems
public boolean allowAliasUnnestItems()Description copied from interface:SqlConformance
Whether directly alias array items in UNNEST.E.g. in UNNEST(a_array, b_array) AS T(a, b), a and b will be aliases of elements in a_array and b_array respectively.
Without this flag set, T will be the alias of the element in a_array and a, b will be the top level fields of T if T is a STRUCT type.
Among the built-in conformance levels, true in
SqlConformanceEnum.PRESTO
; false otherwise.- Specified by:
allowAliasUnnestItems
in interfaceSqlConformance
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allowNiladicParentheses
public boolean allowNiladicParentheses()Description copied from interface:SqlConformance
Whether to allow parentheses to be specified in calls to niladic functions and procedures (that is, functions and procedures with no parameters).For example,
CURRENT_DATE
is a niladic system function. In standard SQL it must be invoked without parentheses:VALUES CURRENT_DATE
If
allowNiladicParentheses
, the following syntax is also valid:VALUES CURRENT_DATE()
Of the popular databases, MySQL, Apache Phoenix and VoltDB allow this behavior; Apache Hive, HSQLDB, IBM DB2, Microsoft SQL Server, Oracle, PostgreSQL do not.
Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
; false otherwise.- Specified by:
allowNiladicParentheses
in interfaceSqlConformance
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allowExplicitRowValueConstructor
public boolean allowExplicitRowValueConstructor()Description copied from interface:SqlConformance
Whether to allow SQL syntax "ROW(expr1, expr2, expr3)
".The equivalent syntax in standard SQL is "
(expr1, expr2, expr3)
".Standard SQL does not allow this because the type is not well-defined. However, PostgreSQL allows this behavior.
Standard SQL allows row expressions in other contexts, for instance inside
VALUES
clause.Among the built-in conformance levels, true in
SqlConformanceEnum.DEFAULT
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.PRESTO
; false otherwise.- Specified by:
allowExplicitRowValueConstructor
in interfaceSqlConformance
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allowExtend
public boolean allowExtend()Description copied from interface:SqlConformance
Whether to allow mixing table columns with extended columns inINSERT
(orUPSERT
).For example, suppose that the declaration of table
T
has columnsA
andB
, and you want to insert data of columnC INTEGER
not present in the table declaration as an extended column. You can specify the columns in anINSERT
statement as follows:INSERT INTO T (A, B, C INTEGER) VALUES (1, 2, 3)
Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
; false otherwise.- Specified by:
allowExtend
in interfaceSqlConformance
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isLimitStartCountAllowed
public boolean isLimitStartCountAllowed()Description copied from interface:SqlConformance
Whether to allow the SQL syntax "LIMIT start, count
".The equivalent syntax in standard SQL is "
OFFSET start ROW FETCH FIRST count ROWS ONLY
", and in PostgreSQL "LIMIT count OFFSET start
".MySQL and CUBRID allow this behavior.
Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
; false otherwise.- Specified by:
isLimitStartCountAllowed
in interfaceSqlConformance
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isOffsetLimitAllowed
public boolean isOffsetLimitAllowed()Description copied from interface:SqlConformance
Whether to allow the SQL syntax "OFFSET start LIMIT count
" (that is,OFFSET
beforeLIMIT
, in addition toLIMIT
beforeOFFSET
andOFFSET
beforeFETCH
).The equivalent syntax in standard SQL is "
OFFSET start ROW FETCH FIRST count ROWS ONLY
".Trino allows this behavior.
Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
; false otherwise.- Specified by:
isOffsetLimitAllowed
in interfaceSqlConformance
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allowGeometry
public boolean allowGeometry()Description copied from interface:SqlConformance
Whether to allow geo-spatial extensions, including the GEOMETRY type.Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
,SqlConformanceEnum.PRESTO
,SqlConformanceEnum.SQL_SERVER_2008
; false otherwise.- Specified by:
allowGeometry
in interfaceSqlConformance
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shouldConvertRaggedUnionTypesToVarying
public boolean shouldConvertRaggedUnionTypesToVarying()Description copied from interface:SqlConformance
Whether the least restrictive type of a number of CHAR types of different lengths should be a VARCHAR type. And similarly BINARY to VARBINARY.For example, consider the query
SELECT 'abcde' UNION SELECT 'xyz'
The input columns have types
CHAR(5)
andCHAR(3)
, and we need a result type that is large enough for both:- Under strict SQL:2003 behavior, its column has type
CHAR(5)
, and the value in the second row will have trailing spaces. - With lenient behavior, its column has type
VARCHAR(5)
, and the values have no trailing spaces.
Among the built-in conformance levels, true in
SqlConformanceEnum.PRAGMATIC_99
,SqlConformanceEnum.PRAGMATIC_2003
,SqlConformanceEnum.MYSQL_5
,SqlConformanceEnum.ORACLE_10
,SqlConformanceEnum.ORACLE_12
,SqlConformanceEnum.PRESTO
,SqlConformanceEnum.SQL_SERVER_2008
; false otherwise.- Specified by:
shouldConvertRaggedUnionTypesToVarying
in interfaceSqlConformance
- Under strict SQL:2003 behavior, its column has type
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allowExtendedTrim
public boolean allowExtendedTrim()Description copied from interface:SqlConformance
Whether TRIM should support more than one trim character.For example, consider the query
SELECT TRIM('eh' FROM 'hehe__hehe')
Under strict behavior, if the length of trim character is not 1, TRIM throws an exception, and the query fails. However many implementations (in databases such as MySQL and SQL Server) trim all the characters, resulting in a return value of '__'.
Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
,SqlConformanceEnum.SQL_SERVER_2008
; false otherwise.- Specified by:
allowExtendedTrim
in interfaceSqlConformance
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allowPluralTimeUnits
public boolean allowPluralTimeUnits()Description copied from interface:SqlConformance
Whether interval literals should allow plural time units such as "YEARS" and "DAYS" in interval literals.Under strict behavior,
INTERVAL '2' DAY
is valid andINTERVAL '2' DAYS
is invalid; PostgreSQL allows both; Oracle only allows singular time units.Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
; false otherwise.- Specified by:
allowPluralTimeUnits
in interfaceSqlConformance
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allowQualifyingCommonColumn
public boolean allowQualifyingCommonColumn()Description copied from interface:SqlConformance
Whether to allow a qualified common column in a query that has a NATURAL join or a join with a USING clause.For example, in the query
SELECT emp.deptno FROM emp JOIN dept USING (deptno)
deptno
is the common column. A qualified common column such asemp.deptno
is not allowed in Oracle, but is allowed in PostgreSQL.Among the built-in conformance levels, false in
SqlConformanceEnum.ORACLE_10
,SqlConformanceEnum.ORACLE_12
,SqlConformanceEnum.PRESTO
,SqlConformanceEnum.STRICT_92
,SqlConformanceEnum.STRICT_99
,SqlConformanceEnum.STRICT_2003
; true otherwise.- Specified by:
allowQualifyingCommonColumn
in interfaceSqlConformance
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isValueAllowed
public boolean isValueAllowed()Description copied from interface:SqlConformance
WhetherVALUE
is allowed as an alternative toVALUES
in the parser.Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
,SqlConformanceEnum.LENIENT
,SqlConformanceEnum.MYSQL_5
; false otherwise.- Specified by:
isValueAllowed
in interfaceSqlConformance
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semantics
Description copied from interface:SqlConformance
Controls the behavior of operators that are part of Standard SQL but nevertheless have different behavior in different databases.Consider the
SUBSTRING
operator. In ISO standard SQL, negative start indexes are converted to 1; in Google BigQuery, negative start indexes are treated as offsets from the end of the string. For example,SUBSTRING('abcde' FROM -3 FOR 2)
returns'ab'
in standard SQL and 'cd' in BigQuery.If you specify
conformance=BIG_QUERY
in your connection parameters,SUBSTRING
will give the BigQuery behavior. Similarly MySQL and Oracle.Among the built-in conformance levels:
SqlConformanceEnum.BIG_QUERY
returnsSqlLibrary.BIG_QUERY
;SqlConformanceEnum.MYSQL_5
returnsSqlLibrary.MYSQL
;SqlConformanceEnum.ORACLE_10
andSqlConformanceEnum.ORACLE_12
returnSqlLibrary.ORACLE
;- otherwise returns
SqlLibrary.STANDARD
.
- Specified by:
semantics
in interfaceSqlConformance
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allowLenientCoercion
public boolean allowLenientCoercion()Description copied from interface:SqlConformance
Whether to allow lenient type coercions.Coercions include:
- Coercion of string literal to array literal. For example,
SELECT ARRAY[0,1,2] == '{0,1,2}'
- Casting
BOOLEAN
values to one of the following numeric types:TINYINT
,SMALLINT
,INTEGER
,BIGINT
.
Among the built-in conformance levels, true in
SqlConformanceEnum.BABEL
, false otherwise.- Specified by:
allowLenientCoercion
in interfaceSqlConformance
- Coercion of string literal to array literal. For example,
-