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Add support for Timestamp data type in SQL Select (#7185)

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This change adds support for casting strings to Timestamp via CAST:
`CAST('2010T' AS TIMESTAMP)`

It also implements the following date-time functions:
  - UTCNOW()
  - DATE_ADD()
  - DATE_DIFF()
  - EXTRACT()

For values passed to these functions, date-types are automatically
inferred.
This commit is contained in:
Aditya Manthramurthy
2019-02-04 20:54:45 -08:00
committed by kannappanr
parent ea6d61ab1f
commit f04f8bbc78
10 changed files with 514 additions and 35 deletions
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18
pkg/s3select/sql/parser.go
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@@ -247,6 +247,8 @@ type FuncExpr struct {
Substring *SubstringFunc `parser:"| @@"`
Extract *ExtractFunc `parser:"| @@"`
Trim *TrimFunc `parser:"| @@"`
DateAdd *DateAddFunc `parser:"| @@"`
DateDiff *DateDiffFunc `parser:"| @@"`
// Used during evaluation for aggregation funcs
aggregate *aggVal
@@ -255,7 +257,7 @@ type FuncExpr struct {
// SimpleArgFunc represents functions with simple expression
// arguments.
type SimpleArgFunc struct {
FunctionName string `parser:" @(\"AVG\" | \"MAX\" | \"MIN\" | \"SUM\" | \"COALESCE\" | \"NULLIF\" | \"DATE_ADD\" | \"DATE_DIFF\" | \"TO_STRING\" | \"TO_TIMESTAMP\" | \"UTCNOW\" | \"CHAR_LENGTH\" | \"CHARACTER_LENGTH\" | \"LOWER\" | \"UPPER\") "`
FunctionName string `parser:" @(\"AVG\" | \"MAX\" | \"MIN\" | \"SUM\" | \"COALESCE\" | \"NULLIF\" | \"TO_STRING\" | \"TO_TIMESTAMP\" | \"UTCNOW\" | \"CHAR_LENGTH\" | \"CHARACTER_LENGTH\" | \"LOWER\" | \"UPPER\") "`
ArgsList []*Expression `parser:"\"(\" (@@ (\",\" @@)*)?\")\""`
}
@@ -294,6 +296,20 @@ type TrimFunc struct {
TrimFrom *PrimaryTerm `parser:" \"FROM\" )? @@ \")\" "`
}
// DateAddFunc represents the DATE_ADD function
type DateAddFunc struct {
DatePart string `parser:" \"DATE_ADD\" \"(\" @( \"YEAR\":Timeword | \"MONTH\":Timeword | \"DAY\":Timeword | \"HOUR\":Timeword | \"MINUTE\":Timeword | \"SECOND\":Timeword ) \",\""`
Quantity *Operand `parser:" @@ \",\""`
Timestamp *PrimaryTerm `parser:" @@ \")\""`
}
// DateDiffFunc represents the DATE_DIFF function
type DateDiffFunc struct {
DatePart string `parser:" \"DATE_DIFF\" \"(\" @( \"YEAR\":Timeword | \"MONTH\":Timeword | \"DAY\":Timeword | \"HOUR\":Timeword | \"MINUTE\":Timeword | \"SECOND\":Timeword ) \",\" "`
Timestamp1 *PrimaryTerm `parser:" @@ \",\" "`
Timestamp2 *PrimaryTerm `parser:" @@ \")\" "`
}
// LitValue represents a literal value parsed from the sql
type LitValue struct {
Number *float64 `parser:"( @Number"`