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ClickHouse/utils/grammar/ClickHouseParser.g4
liyang 59f0431e2d fix bug in select_with_query
2019-12-19 20:33:49 +08:00

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parser grammar ClickHouseParser;
options {
tokenVocab=ClickHouseLexer;
}
// эта грамматика написана по сорсам парсеров, имена правил примерно соответствуют парсерам в cpp.
// известные расхождения
// 1. скобки не обязательно сразу идут после имени функции.
// 2. многословные токены поделены на самостоятельные слова
// 3. для INSERT запроса не написана часть парсинга значений.
// 4. правило для expr переписано чтобы понизить глубину AST и сразу выходить на уровень expr - al
parse
: ( query | err ) EOF
;
query
: show_tables_query
| select_query
| insert_query
| create_query
| rename_query
| drop_query
| alter_query
| use_query
| set_query
| optimize_query
| table_properties_query
| show_processlist_query
| check_query
| kill_query_query
;
// 1. QUERIES
select_query
: select_query_main ( K_UNION K_ALL select_query_main ) *
query_outfile_step?
select_format_step?
;
select_query_main
: select_with_step?
select_select_step select_from_step?
K_FINAL? select_sample_step?
select_array_join_step? select_join_step?
select_prewhere_step? select_where_step?
select_groupby_step? select_having_step?
select_orderby_step?
select_limitby_step? select_limit_step?
select_settings_step?
;
select_with_step
: K_WITH select_expr_list
;
select_select_step
: K_SELECT K_DISTINCT? select_expr_list
;
select_from_step
: K_FROM ( full_table_name
| table_function
| subquery
) select_alias?
;
select_array_join_step
: K_LEFT? K_ARRAY K_JOIN not_empty_expression_list
;
select_sample_step
: K_SAMPLE sample_ratio (K_OFFSET sample_ratio ) ?
;
sample_ratio
: NUMERIC_LITERAL ( DIVIDE NUMERIC_LITERAL ) ?
;
select_join_step
: K_GLOBAL?
( K_ANY | K_ALL ) ( K_INNER | K_LEFT K_OUTER? | K_RIGHT K_OUTER? | K_FULL K_OUTER? ) K_JOIN select_join_right_part
( K_USING LPAREN not_empty_expression_list RPAREN
| K_USING not_empty_expression_list
// | K_ON expr на самом деле нет.
)
| K_GLOBAL? K_CROSS K_JOIN select_join_right_part
;
select_join_right_part
: identifier
| subquery
;
select_prewhere_step
: K_PREWHERE expression_with_optional_alias
;
select_where_step
: K_WHERE expression_with_optional_alias
;
select_groupby_step
: K_GROUP K_BY not_empty_expression_list ( K_WITH K_TOTALS ) ?
;
select_having_step
: K_HAVING expression_with_optional_alias
;
select_orderby_step
: K_ORDER K_BY order_by_expression_list
;
select_limit_step
: K_LIMIT NUMERIC_LITERAL ( COMMA NUMERIC_LITERAL )?
;
select_limitby_step
: K_LIMIT NUMERIC_LITERAL K_BY not_empty_expression_list
;
select_settings_step
: K_SETTINGS assignment_list
;
select_format_step
: K_FORMAT identifier
;
insert_query
: K_INSERT K_INTO full_table_name
( K_ID ASSIGN STRING_LITERAL )? // wtf?
( LPAREN column_name_list RPAREN )?
( K_VALUES LPAREN literal (COMMA literal )* RPAREN(COMMA LPAREN literal (COMMA literal )* RPAREN)* // ch тут дальше не парсит. а я написал скобки
| K_FORMAT format_name // ch тут дальше не парсит, только доедает все пробелы или один перевод строки. pushMode()
| select_query )
;
create_query
: ( K_CREATE | K_ATTACH ) K_TEMPORARY?
( K_DATABASE ( K_IF K_NOT K_EXISTS ) ? database_name
| K_TABLE ( K_IF K_NOT K_EXISTS ) ? full_table_name ( K_ON K_CLUSTER cluster_name ) ?
( LPAREN column_declaration_list RPAREN engine ( K_AS select_query ) ? // если VIEW - то есть и колонки и select.
| engine K_AS ( select_query
| full_table_name engine? // wtf
)
)
| K_MATERIALIZED? K_VIEW ( K_IF K_NOT K_EXISTS ) ? full_table_name
( LPAREN column_declaration_list RPAREN ) ? engine? K_POPULATE? K_AS select_query
)
;
rename_query
: K_RENAME K_TABLE full_table_name K_TO full_table_name ( COMMA full_table_name K_TO full_table_name )* ( K_ON K_CLUSTER cluster_name ) ?
;
drop_query
: ( K_DROP | K_DETACH )
( K_DATABASE ( K_IF K_EXISTS ) ? database_name ( K_ON K_CLUSTER cluster_name ) ?
| K_TABLE ( K_IF K_EXISTS ) ? full_table_name ( K_ON K_CLUSTER cluster_name ) ?
)
;
alter_query
: K_ALTER K_TABLE full_table_name ( K_ON K_CLUSTER cluster_name ) ?
alter_query_element ( COMMA alter_query_element ) *
;
alter_query_element
: K_ADD K_COLUMN compound_name_type_pair ( K_AFTER column_name ) ?
| K_DROP K_COLUMN column_name
| K_MODIFY K_COLUMN compound_name_type_pair
| K_ATTACH K_PARTITION partition_name
| K_DETACH K_PARTITION partition_name
| K_DROP K_PARTITION partition_name
| K_FETCH K_PARTITION partition_name K_FROM STRING_LITERAL
| K_FREEZE K_PARTITION partition_name
;
clickhouse_type
: simple_type
| T_AGGREGATE_FUNCTION LPAREN function_name ( COMMA clickhouse_type ) * RPAREN
| T_ARRAY LPAREN clickhouse_type RPAREN
| T_TUPLE LPAREN clickhouse_type ( COMMA clickhouse_type ) * RPAREN
| T_NULLABLE LPAREN clickhouse_type LPAREN
;
simple_type
: T_UINT8
| T_UINT16
| T_UINT32
| T_UINT64
| T_INT8
| T_INT16
| T_INT32
| T_INT64
| T_FLOAT32
| T_FLOAT64
| T_ENUM8 LPAREN enum_entry ( COMMA enum_entry ) * LPAREN
| T_ENUM16 LPAREN enum_entry ( COMMA enum_entry ) * LPAREN
| T_UUID
| T_DATE
| T_DATETIME
| T_STRING
| T_INTERVAL_YEAR
| T_INTERVAL_MONTH
| T_INTERVAL_WEEK
| T_INTERVAL_DAY
| T_INTERVAL_HOUR
| T_INTERVAL_MINUTE
| T_INTERVAL_SECOND
| T_NULL
| T_FIXEDSTRING LPAREN NUMERIC_LITERAL LPAREN
;
enum_entry
: STRING_LITERAL ASSIGN NUMERIC_LITERAL
;
use_query
: K_USE database_name
;
set_query
: K_SET K_GLOBAL? assignment_list
;
assignment_list
: assignment ( COMMA assignment ) *
;
assignment
: identifier ASSIGN literal
;
kill_query_query
: K_KILL K_QUERY K_WHERE expression_with_optional_alias ( K_SYNC | K_ASYNC | K_TEST )
;
optimize_query
: K_OPTIMIZE K_TABLE full_table_name ( K_PARTITION STRING_LITERAL ) ? K_FINAL?
;
table_properties_query
: ( K_EXISTS | ( K_DESCRIBE | K_DESC ) | K_SHOW K_CREATE ) K_TABLE full_table_name query_outfile_step? ( K_FORMAT format_name ) ?
;
show_tables_query
: K_SHOW ( K_DATABASES
| K_TABLES ( K_FROM database_name ) ? ( K_NOT? K_LIKE STRING_LITERAL ) ? )
query_outfile_step?
( K_FORMAT format_name ) ?
;
show_processlist_query
: K_SHOW K_PROCESSLIST query_outfile_step? ( K_FORMAT format_name ) ?
;
check_query
: K_CHECK K_TABLE full_table_name
;
// 2. QUERY ELEMENTS
full_table_name
: ( database_name DOT ) ? table_name
;
partition_name
: identifier | STRING_LITERAL
;
cluster_name
: identifier | STRING_LITERAL
;
database_name
: identifier
;
table_name
: identifier
;
format_name
: identifier
;
query_outfile_step
: K_INTO K_OUTFILE STRING_LITERAL
;
engine
: K_ENGINE ASSIGN identifier_with_optional_parameters
;
identifier_with_optional_parameters
: identifier_with_parameters
| identifier
;
identifier_with_parameters
: function
| nested_table
;
order_by_expression_list
: order_by_element ( COMMA order_by_element ) *
;
order_by_element
: expression_with_optional_alias ( K_DESC | K_DESCENDING | K_ASC | K_ASCENDING ) ? ( K_NULLS ( K_FIRST | K_LAST ) ) ? ( K_COLLATE STRING_LITERAL ) ?
;
nested_table
: identifier LPAREN name_type_pair_list RPAREN
;
name_type_pair_list
: name_type_pair ( COMMA name_type_pair ) *
;
name_type_pair
: identifier column_type
;
compound_name_type_pair
: compound_identifier column_type
;
column_declaration_list
: column_declaration ( COMMA column_declaration ) *
;
column_declaration
: column_name
( ( K_DEFAULT | K_MATERIALIZED | K_ALIAS ) expr
| column_type
)
;
column_name
: identifier
;
column_type
: clickhouse_type
;
column_name_list
: column_name ( COMMA column_name ) *
;
select_expr_list
: select_expr ( COMMA select_expr) *
;
select_expr
: expr select_alias?
;
select_alias
: K_AS? alias_name
;
alias
: K_AS alias_name
;
alias_name
: identifier
;
table_function
: function
;
subquery
: LPAREN select_query_main RPAREN
;
expression_with_optional_alias
: expr alias?
;
// EXPRESSIONS
expr
: LPAREN expr RPAREN # ExprParen
| function # ExprFunction
| K_CASE expr? ( K_WHEN expr K_THEN expr ) ( K_WHEN expr K_THEN expr ) * K_ELSE expr K_END # ExprCase
| expr DOT expr # ExprTupleElement
| expr LBRAKET expr RBRAKET # ExprArrayElement
| MINUS expr # ExprUnaryMinus
| K_CAST LPAREN expr K_AS clickhouse_type RPAREN # ExprCast
| expr ( STAR | DIVIDE | PERCENT ) expr # ExprMul
| expr ( PLUS | MINUS ) expr # ExprAdd
| expr CONCAT expr # ExprConcat
| expr K_BETWEEN expr K_AND expr # ExprBetween
| expr ( EQUALS | ASSIGN | NOT_EQUALS | NOT_EQUALS2 | LE | GE | LT | GT | K_LIKE | K_NOT K_LIKE ) expr # ExprLogical
| expr ( K_IN | K_NOT K_IN | K_GLOBAL K_IN | K_GLOBAL K_NOT K_IN ) expr # ExprIn
| expr ( K_IS K_NULL | K_IS K_NOT K_NULL ) # ExprIsNull
| K_INTERVAL expr interval_unit # ExprInterval
| K_NOT expr # ExprNot
| expr K_AND expr # ExprAnd
| expr K_OR expr # ExprOr
| expr QUESTION expr COLON expr # ExprTernary
| ( LPAREN identifier ( COMMA identifier )* RPAREN | identifier ( COMMA identifier )* ) RARROW expr # ExprLambda
| subquery # ExprSubquery
| LPAREN not_empty_expression_list RPAREN # ExprList
| array # ExprArray
| literal # ExprLiteral
| compound_identifier # ExprId
| STAR # ExprStar
| expr alias # ExprWithAlias
;
interval_unit
: K_YEAR
| K_MONTH
| K_WEEK
| K_DAY
| K_HOUR
| K_MINUTE
| K_SECOND
;
expression_list
: ( not_empty_expression_list )?
;
not_empty_expression_list
: expr ( COMMA expr )*
;
array
: LBRAKET expression_list RBRAKET
;
function
: function_name function_parameters? function_arguments
;
function_parameters
: LPAREN ( expr ( COMMA expr )* )? RPAREN
;
function_arguments
: LPAREN ( expr ( COMMA expr )* )? RPAREN
;
function_name
: identifier
;
identifier
: QUOTED_LITERAL
| IDENTIFIER
// в данном случае мы разрешаем ключевым словам выступать в качестве имен колонок или функций.
| simple_type
| keyword
;
keyword
: K_ADD
| K_AFTER
| K_ALL
| K_ALIAS
| K_ALTER
| K_AND
| K_ANY
| K_ARRAY
| K_AS
| K_ASCENDING
| K_ASC
| K_ASYNC
| K_ATTACH
| K_BETWEEN
| K_BY
| K_CASE
| K_CHECK
| K_COLUMN
| K_COLLATE
| K_CREATE
| K_CROSS
| K_DESCRIBE
| K_DESCENDING
| K_DESC
| K_DATABASE
| K_DATABASES
| K_DEFAULT
| K_DETACH
| K_DISTINCT
| K_DROP
| K_ENGINE
| K_ELSE
| K_END
| K_EXISTS
| K_FINAL
| K_FIRST
| K_FROM
| K_FORMAT
| K_FULL
| K_GLOBAL
| K_GROUP
| K_HAVING
| K_ID
| K_IF
| K_INNER
| K_INSERT
| K_INTO
| K_IN
| K_IS
| K_JOIN
| K_KILL
| K_LAST
| K_LEFT
| K_LIKE
| K_LIMIT
| K_MAIN
| K_MATERIALIZED
| K_MODIFY
| K_NOT
| K_NULL
| K_NULLS
| K_OFFSET
| K_ON
| K_OPTIMIZE
| K_ORDER
| K_OR
| K_OUTFILE
| K_PARTITION
| K_POPULATE
| K_PREWHERE
| K_PROCESSLIST
| K_QUERY
| K_RENAME
| K_RETURN
| K_RIGHT
| K_SAMPLE
| K_SELECT
| K_SET
| K_SETTINGS
| K_SHOW
| K_SYNC
| K_TABLE
| K_TABLES
| K_TEMPORARY
| K_TEST
| K_THEN
| K_TOTALS
| K_TO
| K_OUTER
| K_VALUES
| K_VIEW
| K_UNION
| K_USE
| K_USING
| K_WHEN
| K_WHERE
| K_WITH
;
compound_identifier
: identifier DOT identifier
| identifier
;
literal
: K_NULL
| NUMERIC_LITERAL
| STRING_LITERAL
;
err
: UNEXPECTED_CHAR
{
throw new RuntimeException("UNEXPECTED_CHAR=" + $UNEXPECTED_CHAR.text);
}
;
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