我想在我的SQL解析器中支持FOO_GREATER_THAN子句而不是>。 例如： 从* FOO_GREATER_THAN 10岁的人群中选择*
我关注了https://calcite.apache.org/docs/adapter.html#extending-the-parser，并添加了自定义fmpp和ftl文件，但无法添加。
parserImpls.ftl
SqlKind regRealtionalOperator() :
SqlKind regRealtionalOperator() :
{
}
{
<FOO_EQUAL> { return SqlKind.EQUALS; }
|
<FOO_GREATER_THAN> { return SqlKind.NOT_EQUALS; }
}
config.fmpp
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to you 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,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# This file is an FMPP (http://fmpp.sourceforge.net/) configuration file to
# allow clients to extend Calcite's SQL parser to support application specific
# SQL statements, literals or data types.
#
# Calcite's parser grammar file (Parser.jj) is written in javacc
# (http://javacc.java.net/) with Freemarker (http://freemarker.org/) variables
# to allow clients to:
# 1. have custom parser implementation class and package name.
# 2. insert new parser method implementations written in javacc to parse
# custom:
# a) SQL statements.
# b) literals.
# c) data types.
# 3. add new keywords to support custom SQL constructs added as part of (2).
# 4. add import statements needed by inserted custom parser implementations.
#
# Parser template file (Parser.jj) along with this file are packaged as
# part of the calcite-core-<version>.jar under "codegen" directory.
data: {
parser: {
# Generated parser implementation package and class name.
package: "org.apache.calcite.sql.parser.impl",
class: "SqlParserImpl",
# List of additional classes and packages to import.
# Example. "org.apache.calcite.sql.*", "java.util.List".
imports: [
]
# List of new keywords. Example: "DATABASES", "TABLES". If the keyword is not a reserved
# keyword add it to 'nonReservedKeywords' section.
keywords: [
"FOO_EQUAL"
"FOO_GREATER_THAN"
]
# List of keywords from "keywords" section that are not reserved.
nonReservedKeywords: [
"A"
"ABSENT"
"ABSOLUTE"
"ACTION"
"ADA"
"ADD"
"ADMIN"
"AFTER"
"ALWAYS"
"APPLY"
"ASC"
"ASSERTION"
"ASSIGNMENT"
"ATTRIBUTE"
"ATTRIBUTES"
"BEFORE"
"BERNOULLI"
"BREADTH"
"C"
"CASCADE"
"CATALOG"
"CATALOG_NAME"
"CENTURY"
"CHAIN"
"CHARACTER_SET_CATALOG"
"CHARACTER_SET_NAME"
"CHARACTER_SET_SCHEMA"
"CHARACTERISTICS"
"CHARACTERS"
"CLASS_ORIGIN"
"COBOL"
"COLLATION"
"COLLATION_CATALOG"
"COLLATION_NAME"
"COLLATION_SCHEMA"
"COLUMN_NAME"
"COMMAND_FUNCTION"
"COMMAND_FUNCTION_CODE"
"COMMITTED"
"CONDITION_NUMBER"
"CONDITIONAL"
"CONNECTION"
"CONNECTION_NAME"
"CONSTRAINT_CATALOG"
"CONSTRAINT_NAME"
"CONSTRAINT_SCHEMA"
"CONSTRAINTS"
"CONSTRUCTOR"
"CONTINUE"
"CURSOR_NAME"
"DATA"
"DATABASE"
"DATETIME_INTERVAL_CODE"
"DATETIME_INTERVAL_PRECISION"
"DECADE"
"DEFAULTS"
"DEFERRABLE"
"DEFERRED"
"DEFINED"
"DEFINER"
"DEGREE"
"DEPTH"
"DERIVED"
"DESC"
"DESCRIPTION"
"DESCRIPTOR"
"DIAGNOSTICS"
"DISPATCH"
"DOMAIN"
"DOW"
"DOY"
"DYNAMIC_FUNCTION"
"DYNAMIC_FUNCTION_CODE"
"ENCODING"
"EPOCH"
"ERROR"
"EXCEPTION"
"EXCLUDE"
"EXCLUDING"
"FINAL"
"FIRST"
"FOLLOWING"
"FORMAT"
"FORTRAN"
"FOUND"
"FRAC_SECOND"
"G"
"GENERAL"
"GENERATED"
"GEOMETRY"
"GO"
"GOTO"
"GRANTED"
"HIERARCHY"
"IGNORE"
"IMMEDIATE"
"IMMEDIATELY"
"IMPLEMENTATION"
"INCLUDING"
"INCREMENT"
"INITIALLY"
"INPUT"
"INSTANCE"
"INSTANTIABLE"
"INVOKER"
"ISODOW"
"ISOYEAR"
"ISOLATION"
"JAVA"
"JSON"
"K"
"KEY"
"KEY_MEMBER"
"KEY_TYPE"
"LABEL"
"LAST"
"LENGTH"
"LEVEL"
"LIBRARY"
"LOCATOR"
"M"
"MAP"
"MATCHED"
"MAXVALUE"
"MICROSECOND"
"MESSAGE_LENGTH"
"MESSAGE_OCTET_LENGTH"
"MESSAGE_TEXT"
"MILLISECOND"
"MILLENNIUM"
"MINVALUE"
"MORE_"
"MUMPS"
"NAME"
"NAMES"
"NANOSECOND"
"NESTING"
"NORMALIZED"
"NULLABLE"
"NULLS"
"NUMBER"
"OBJECT"
"OCTETS"
"OPTION"
"OPTIONS"
"ORDERING"
"ORDINALITY"
"OTHERS"
"OUTPUT"
"OVERRIDING"
"PAD"
"PARAMETER_MODE"
"PARAMETER_NAME"
"PARAMETER_ORDINAL_POSITION"
"PARAMETER_SPECIFIC_CATALOG"
"PARAMETER_SPECIFIC_NAME"
"PARAMETER_SPECIFIC_SCHEMA"
"PARTIAL"
"PASCAL"
"PASSING"
"PASSTHROUGH"
"PAST"
"PATH"
"PLACING"
"PLAN"
"PLI"
"PRECEDING"
"PRESERVE"
"PRIOR"
"PRIVILEGES"
"PUBLIC"
"QUARTER"
"READ"
"RELATIVE"
"REPEATABLE"
"REPLACE"
"RESPECT"
"RESTART"
"RESTRICT"
"RETURNED_CARDINALITY"
"RETURNED_LENGTH"
"RETURNED_OCTET_LENGTH"
"RETURNED_SQLSTATE"
"RETURNING"
"ROLE"
"ROUTINE"
"ROUTINE_CATALOG"
"ROUTINE_NAME"
"ROUTINE_SCHEMA"
"ROW_COUNT"
"SCALAR"
"SCALE"
"SCHEMA"
"SCHEMA_NAME"
"SCOPE_CATALOGS"
"SCOPE_NAME"
"SCOPE_SCHEMA"
"SECTION"
"SECURITY"
"SELF"
"SEQUENCE"
"SERIALIZABLE"
"SERVER"
"SERVER_NAME"
"SESSION"
"SETS"
"SIMPLE"
"SIZE"
"SOURCE"
"SPACE"
"SPECIFIC_NAME"
"SQL_BIGINT"
"SQL_BINARY"
"SQL_BIT"
"SQL_BLOB"
"SQL_BOOLEAN"
"SQL_CHAR"
"SQL_CLOB"
"SQL_DATE"
"SQL_DECIMAL"
"SQL_DOUBLE"
"SQL_FLOAT"
"SQL_INTEGER"
"SQL_INTERVAL_DAY"
"SQL_INTERVAL_DAY_TO_HOUR"
"SQL_INTERVAL_DAY_TO_MINUTE"
"SQL_INTERVAL_DAY_TO_SECOND"
"SQL_INTERVAL_HOUR"
"SQL_INTERVAL_HOUR_TO_MINUTE"
"SQL_INTERVAL_HOUR_TO_SECOND"
"SQL_INTERVAL_MINUTE"
"SQL_INTERVAL_MINUTE_TO_SECOND"
"SQL_INTERVAL_MONTH"
"SQL_INTERVAL_SECOND"
"SQL_INTERVAL_YEAR"
"SQL_INTERVAL_YEAR_TO_MONTH"
"SQL_LONGVARBINARY"
"SQL_LONGVARNCHAR"
"SQL_LONGVARCHAR"
"SQL_NCHAR"
"SQL_NCLOB"
"SQL_NUMERIC"
"SQL_NVARCHAR"
"SQL_REAL"
"SQL_SMALLINT"
"SQL_TIME"
"SQL_TIMESTAMP"
"SQL_TINYINT"
"SQL_TSI_DAY"
"SQL_TSI_FRAC_SECOND"
"SQL_TSI_HOUR"
"SQL_TSI_MICROSECOND"
"SQL_TSI_MINUTE"
"SQL_TSI_MONTH"
"SQL_TSI_QUARTER"
"SQL_TSI_SECOND"
"SQL_TSI_WEEK"
"SQL_TSI_YEAR"
"SQL_VARBINARY"
"SQL_VARCHAR"
"STATE"
"STATEMENT"
"STRUCTURE"
"STYLE"
"SUBCLASS_ORIGIN"
"SUBSTITUTE"
"TABLE_NAME"
"TEMPORARY"
"TIES"
"TIMESTAMPADD"
"TIMESTAMPDIFF"
"TOP_LEVEL_COUNT"
"TRANSACTION"
"TRANSACTIONS_ACTIVE"
"TRANSACTIONS_COMMITTED"
"TRANSACTIONS_ROLLED_BACK"
"TRANSFORM"
"TRANSFORMS"
"TRIGGER_CATALOG"
"TRIGGER_NAME"
"TRIGGER_SCHEMA"
"TYPE"
"UNBOUNDED"
"UNCOMMITTED"
"UNCONDITIONAL"
"UNDER"
"UNNAMED"
"USAGE"
"USER_DEFINED_TYPE_CATALOG"
"USER_DEFINED_TYPE_CODE"
"USER_DEFINED_TYPE_NAME"
"USER_DEFINED_TYPE_SCHEMA"
"UTF8"
"UTF16"
"UTF32"
"VERSION"
"VIEW"
"WEEK"
"WRAPPER"
"WORK"
"WRITE"
"XML"
"ZONE"
]
# List of additional join types. Each is a method with no arguments.
# Example: LeftSemiJoin()
joinTypes: [
]
# List of methods for parsing custom SQL statements.
# Return type of method implementation should be 'SqlNode'.
# Example: SqlShowDatabases(), SqlShowTables().
statementParserMethods: [
]
# List of methods for parsing custom literals.
# Return type of method implementation should be "SqlNode".
# Example: ParseJsonLiteral().
literalParserMethods: [
]
# List of methods for parsing custom data types.
# Return type of method implementation should be "SqlIdentifier".
# Example: SqlParseTimeStampZ().
dataTypeParserMethods: [
]
# List of methods for parsing extensions to "ALTER <scope>" calls.
# Each must accept arguments "(SqlParserPos pos, String scope)".
# Example: "SqlUploadJarNode"
alterStatementParserMethods: [
]
# List of methods for parsing extensions to "CREATE [OR REPLACE]" calls.
# Each must accept arguments "(SqlParserPos pos, boolean replace)".
createStatementParserMethods: [
]
# List of methods for parsing extensions to "DROP" calls.
# Each must accept arguments "(SqlParserPos pos)".
dropStatementParserMethods: [
]
# List of files in @includes directory that have parser method
# implementations for parsing custom SQL statements, literals or types
# given as part of "statementParserMethods", "literalParserMethods" or
# "dataTypeParserMethods".
implementationFiles: [
"parserImpls.ftl"
]
includeCompoundIdentifier: true
includeBraces: true
includeAdditionalDeclarations: false
}
}
freemarkerLinks: {
includes: includes/
}
我能够看到目标目录的javacc包中生成的SqlParseImp类中存在的regRealtionalOperator方法。同样在generate-source的fmpp中，生成的Parser.jj也包含by方法。 尽管如此，在运行上述查询后，SqlPArseException [引发FOO_GREATER_THAN遇到错误。
答案 0 :(得分：0)
您已将其添加为关键字，但仍需要指出此运算符可在查询中使用的位置。例如，在Parser.jj中，您将看到comp()产生式，它在需要比较运算符的任何地方使用。根据您的运算符在查询中的有效位置，您必须决定如何修改语法。